Gaya APA
R.Shakeshaft,MA,PHD, I, R. (1978).
READER'S DIGEST LIBRARY OF MODERN KNOWLEDGE,2 THE HUMAN WORLD .
London:
.
Gaya MLA
R.Shakeshaft,MA,PHD, Ian, Ridpath,John.
"READER'S DIGEST LIBRARY OF MODERN KNOWLEDGE,2 THE HUMAN WORLD".
London:
,
1978.
Buku.