APA (7th ed.) Citation

Gray, J. S., Gray, J. S., McIntyre, A. D., & Stirn, J. (1990). Manual of methods in aquatic environment research. FAO.

Chicago Style (17th ed.) Citation

Gray, John S., John S. Gray, A. D. McIntyre, and Johze Stirn. Manual of Methods in Aquatic Environment Research. Rome: FAO, 1990.

MLA (9th ed.) Citation

Gray, John S., et al. Manual of Methods in Aquatic Environment Research. FAO, 1990.