APA (7th ed.) Citation

Radtke, G. A. (1979). Budgerigars. T.F.H. Publications.

Chicago Style (17th ed.) Citation

Radtke, Georg A. Budgerigars. Hong Kong ; Neptune, N. J.: T.F.H. Publications, 1979.

MLA (9th ed.) Citation

Radtke, Georg A. Budgerigars. T.F.H. Publications, 1979.