Gaya APA
Utgard, R, &, M, K.
(1974).
Mans Finite Earth
.
United States of America:
Burgess Publishing Company.
Gaya MLA
Utgard, R.O, &, Mc, Kenzie,G.G..
"Mans Finite Earth".
United States of America:
Burgess Publishing Company,
1974.
Text.