APA (7th ed.) Citation

Parker, T. J., Haswell, W. A., & Lowenstein, O. A text - book of zoology (6th edition.). Macmillan.

Chicago Style (17th ed.) Citation

Parker, T. Jeffery, William A. Haswell, and Otto Lowenstein. A Text - Book of Zoology. 6th edition. London: Macmillan.

MLA (8th ed.) Citation

Parker, T. Jeffery, et al. A Text - Book of Zoology. 6th edition. Macmillan.