Gaya APA

GRANT, W, E. et al (1997). ECOLOGY AND NATURAL RESOURCE MANAJEMENT : System Analysis and simulation . AMERIKA SERIKAT: JOHN WEY &SONS INC.

Gaya MLA

GRANT, WILLIAM, E.. et al. "ECOLOGY AND NATURAL RESOURCE MANAJEMENT : System Analysis and simulation". AMERIKA SERIKAT: JOHN WEY &SONS INC, 1997. Text.