Dyfyniad APA

B McManus Collins. (1981). Elementary forestry. Reston publishing company.

Dyfyniad Arddull Chicago

B McManus Collins. Elementary Forestry. Virginia: Reston publishing company, 1981.

Dyfyniad MLA

B McManus Collins. Elementary Forestry. Reston publishing company, 1981.

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