Gaya APA
Weisz, P, B., Keogh, R, N.
(1975).
Elements of Biology
(
Fourth)
.
USA:
mc graw hill.
Gaya MLA
Weisz, Paul, B.., Keogh, Richard, N..
"Elements of Biology".
Fourth
USA:
mc graw hill,
1975.
Text.