Dyfyniad APA

Allen, A. A. (1968). book of bird life (2nd ed.). D. Van Nostrand Company. Inc.

Dyfyniad Arddull Chicago

Allen, Arthur A. Book of Bird Life. 2nd ed. New Jersey: D. Van Nostrand Company. Inc, 1968.

Dyfyniad MLA

Allen, Arthur A. Book of Bird Life. 2nd ed. D. Van Nostrand Company. Inc, 1968.

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