APA

Gray J. S., Mclntyre A. D. & Stirn J. (1992). Manual of Methods on Aquatic Environment Research- Part 11- Biological Assessment of Marine Pollution- with Particular Reference to Benthos: FAO Fisheries Technical Paper No.324 (T324). Rome: Food and Agriculture Organization.

Chicago

Gray John S, Mclntyre Alasdair D and Stirn Jose. 1992. Manual of Methods on Aquatic Environment Research- Part 11- Biological Assessment of Marine Pollution- with Particular Reference to Benthos: FAO Fisheries Technical Paper No.324 (T324). Rome: Food and Agriculture Organization.

Harvard

Gray J. S., Mclntyre A. D. and Stirn J. (1992). Manual of Methods on Aquatic Environment Research- Part 11- Biological Assessment of Marine Pollution- with Particular Reference to Benthos: FAO Fisheries Technical Paper No.324 (T324). Rome: Food and Agriculture Organization.

MLA

Gray John S, Mclntyre Alasdair D and Stirn Jose. Manual of Methods on Aquatic Environment Research- Part 11- Biological Assessment of Marine Pollution- with Particular Reference to Benthos: FAO Fisheries Technical Paper No.324 (T324). Rome: Food and Agriculture Organization. 1992.