@book{smith13,
Author = {Waldo Smith},
Title = {Real Given Names},
Publisher = {Foobar Press},
Address = {Erewhon},
Year = {2013}
}

usepackage[natbibapa]{apacite}
% or you can also use
% usepackage{natbib}

citet*{smith13} demonstrated conclusively that it is possible to generate full names using BibTex.

Waldo Smith (1993) demonstrated conclusively that it is possible to generate full names using BibTex.

defcitealias{smith13}{Waldo Smith (2013)}

citetalias{smith13}