documentclass[a4paper,11pt]{book}
% packages
usepackage[numbers]{natbib}
usepackage[obeyspaces]{url}
usepackage[notintoc]{nomencl}
renewcommand{nomname}{List of Symbols}
makenomenclature
usepackage{booktabs}
newcommand{tabitem}{~~llap{textbullet}~~}
usepackage{blindtext} % needed for creating dummy text passages
%usepackage{ngerman} % needed for German default language
usepackage{amsmath} % needed for command eqref
usepackage{amssymb} % needed for math fonts
usepackage[
    colorlinks=true
    ,breaklinks
    %,ngerman
    ]{hyperref} % needed for creating hyperlinks in the document, the option colorlinks=true gets rid of the awful boxes, breaklinks breaks lonkg links (list of figures), and ngerman sets everything for german as default hyperlinks language
usepackage[hyphenbreaks]{breakurl} % ben�tigt f�r das Brechen von URLs in Literaturreferenzen, hyphenbreaks auch bei links, die �ber eine Seite gehen (mit hyphenation).
usepackage{xcolor}
definecolor{c1}{rgb}{0,0,1} % blue
definecolor{c2}{rgb}{0,0.3,0.9} % light blue
definecolor{c3}{rgb}{0.3,0,0.9} % red blue
hypersetup{
    linkcolor={c1}, % internal links
    citecolor={c2}, % citations
    urlcolor={c3} % external links/urls
}
usepackage{cite} % needed for cite
%usepackage[round, authoryear]{natbib} % needed for cite and abbrvnat bibliography style
usepackage[nottoc]{tocbibind} % needed for displaying bibliography and other in the table of contents
usepackage{graphicx} % needed for includegraphics
usepackage{longtable} % needed for long tables over pages
usepackage{bigstrut} % needed for the command bigstrut
usepackage{enumerate} % needed for some options in enumerate
usepackage{todonotes} % needed for todos
usepackage{makeidx} % needed for creating an index
usepackage{subcaption}
usepackage{array}
makeindex

begin{document}

Someone name some man, citet{farrar2007introduction}. \ woman....citet{castillo2009unified}......asölwnd......citet{herrmann2014structural}....... SHM-Automotive..........citet{smith2007introduction}........ citet{wenzel2008health}.........

bibliographystyle{plainnat}
bibliography{sample_lib}

end{document}

% This file was created with Citavi 5.2.0.8

@book{adams2007health,
 author = {Adams, D.},
 year = {2007},
 title = {Health Monitoring of Structural Materials and Components: Methods with Applications},
 publisher = {Wiley},
 isbn = {9780470511572}
}

@book{castillo2009unified,
 author = {Castillo, Enrique and Fern{'a}ndez-Canteli, Alfonso.},
 year = {2009},
 title = {A unified statistical methodology for modeling fatigue damage},
 keywords = {Fatigue;Materials;Mathematical models},
 address = {Abington},
 publisher = {Springer},
 isbn = {9781402091827}
}


@article{farrar2007introduction,
 author = {Farrar, C. R. and Worden, K.},
 year = {2007},
 title = {An introduction to structural health monitoring},
 pages = {303--315},
 volume = {365},
 number = {1851},
 issn = {1364-503X},
 journal = {Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences}
}


@incollection{herrmann2014structural,
 author = {Herrmann, S. and Wellnitz, J. and Jahn, S. and Leonhardt, S.},
 title = {Structural Health Monitoring for Carbon Fiber Resin Composite Car Body Structures},
 pages = {75--96},
 publisher = {{Springer International Publishing}},
 isbn = {978-3-319-01883-6},
 series = {Lecture Notes in Mobility},
 editor = {Wellnitz, J{"o}rg and Subic, Aleksandar and Trufin, Ramona},
 booktitle = {Sustainable Automotive Technologies 2013},
 year = {2014},
 address = {Cham},
 doi = {url{10.1007/978-3-319-01884-3{textunderscore }8}}
}

 @book{smith2007introduction,
 author = {Smith, J. O.},
 year = {2008},
 title = {Introduction to Digital Filters: With Audio Applications},
 publisher = {W3K},
 isbn = {9780974560717}
}


@book{wenzel2008health,
 author = {Wenzel, H.},
 year = {2008},
 title = {Health Monitoring of Bridges},
 publisher = {Wiley},
 isbn = {9780470740187}
}