Dyfyniad APA

Collings, G. H. (1955). Commercial fetilizers their sources and use (Ed.5.).

Dyfyniad Arddull Chicago

Collings, Gilbert H. Commercial Fetilizers Their Sources and Use. Ed.5. 1955.

Dyfyniad MLA

Collings, Gilbert H. Commercial Fetilizers Their Sources and Use. Ed.5. 1955.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.