Gaya APA

Utgard, R, O., Kenzie, G, D, M. (1973). Man`s Finite Earth . United States of America: Buress Publising Company.

Gaya MLA

Utgard, Russekk, O.., Kenzie, Garry, D., Mc. "Man`s Finite Earth". United States of America: Buress Publising Company, 1973. Text.