APA استشهاد

Collings, G. H. (1955). Commercial fertilizers their source and use (5.). Mc Graw- Hill Book Company Inc.

استشهاد بنمط شيكاغو

Collings, Gilbert H. Commercial Fertilizers Their Source and Use. 5. New York: Mc Graw- Hill Book Company Inc, 1955.

MLA استشهاد

Collings, Gilbert H. Commercial Fertilizers Their Source and Use. 5. Mc Graw- Hill Book Company Inc, 1955.