Dyfyniad APA

(1973). Biological science: An ecologicla approach (3.). Rand mcnally and company.

Dyfyniad Arddull Chicago

Biological Science: An Ecologicla Approach. 3. Chicago: Rand mcnally and company, 1973.

Dyfyniad MLA

Biological Science: An Ecologicla Approach. 3. Rand mcnally and company, 1973.

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