Gaya APA

Wu, O. (1993). Soil Science Society of America Journal Vol. 57 No. 4 July - August 1993 (Vol. 57 No. 4). Madison, Wisconsin, AS: Soil Science Socity of America.

Gaya MLA

Wu, O.. "Soil Science Society of America Journal Vol. 57 No. 4 July - August 1993". Vol. 57 No. 4 Madison, Wisconsin, AS: Soil Science Socity of America, 1993. Text.