# -*- mode: snippet -*-
# name: org-bibtex-book-reference
# key: <rb
# --
* $1
:PROPERTIES:
:CUSTOM_ID:  ${1:$(downcase (string-replace " " "-" yas-text))}
:TITLE:    $1
:BTYPE:    book
:AUTHOR:   $2
:YEAR:     $3
:PUBLISHER: $4
:END:

Accessed `(format-time-string "%d-%B-%Y")`
$0