APA (7th ed.) Citation

Rutgers, A., & Heinzel, K. (1986). Budgerigars in colour: Their care and breeding. Blandford Press.

Chicago Style (17th ed.) Citation

Rutgers, A., and K.J Heinzel. Budgerigars in Colour: Their Care and Breeding. Poole: Blandford Press, 1986.

MLA (9th ed.) Citation

Rutgers, A., and K.J Heinzel. Budgerigars in Colour: Their Care and Breeding. Blandford Press, 1986.