Gaya APA
R.Shakeshaft,MA,PHD, I, R. (1978).
READER'S DIGEST LIBRARY OF MODERN KNOWLEDGE, 1 THE WORLD OF NATURE .
London:
.
Gaya MLA
R.Shakeshaft,MA,PHD, Ian, Ridpath,John.
"READER'S DIGEST LIBRARY OF MODERN KNOWLEDGE, 1 THE WORLD OF NATURE".
London:
,
1978.
Buku.