APA Format
Barrentt, Jim; Williams, Geoff. (1990).
Test your own aptitude / Jim Barrentt and Geoff Williams
. London :: Kogan Page,.
MLA Format
Barrentt, Jim; Williams, Geoff.
Test your own aptitude / Jim Barrentt and Geoff Williams
. London :: Kogan Page,, 1990
Chicago Format
Barrentt, Jim; Williams, Geoff. Test your own aptitude / Jim Barrentt and Geoff Williams. London :: Kogan Page,, 1990.