Gaya APA

Karlen, D. (1997). Soil Science Society Of America Journal Vol. 61 No. 1 January - February 1997 (Vol. 61 No. 1). Madison, Wisconsin, AS: Soil Science Society of America, Inc..

Gaya MLA

Karlen, D.L. "Soil Science Society Of America Journal Vol. 61 No. 1 January - February 1997". Vol. 61 No. 1 Madison, Wisconsin, AS: Soil Science Society of America, Inc., 1997. Text.