Gaya APA

, . (1990). Japanese society of soil science dan plant nutrition liaison committee of soil, fertilizer dan plant nutrition, the 6th division science council of japan organizing committee of the 14th international congress of soil science . Japan: Hokkaido University.

Gaya MLA

, . "Japanese society of soil science dan plant nutrition liaison committee of soil, fertilizer dan plant nutrition, the 6th division science council of japan organizing committee of the 14th international congress of soil science". Japan: Hokkaido University, 1990. Printed Book.