<aura:component implements="force:hasRecordId,flexipage:availableForAllPageTypes">
     <aura:attribute name="recordId" type="Id"/>

    <lightning:recordEditForm  objectApiName="Book__c">
        <lightning:messages />
        <lightning:inputField fieldName="Name" />
        <lightning:inputField fieldName="Account__c"/>

        <lightning:button class="slds-m-top_small" type="submit" label="Create" />
    </lightning:recordEditForm>

</aura:component>