(1973). last two million years: History of man. Readers Digest Association.
Čikaški stil citiranjaLast Two Million Years: History of Man. London: Readers Digest Association, 1973.
MLA način citiranjaLast Two Million Years: History of Man. Readers Digest Association, 1973.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.