APA

Gray N., . (1982). Basic reference books for water pollution officers and staff (freshwater). Dublin: National Institute for Physical Planning and Construction Research. Library bibliography 167.

Chicago

Gray NF, . 1982. Basic reference books for water pollution officers and staff (freshwater). Dublin: National Institute for Physical Planning and Construction Research. Library bibliography 167.

Harvard

Gray N., . (1982). Basic reference books for water pollution officers and staff (freshwater). Dublin: National Institute for Physical Planning and Construction Research. Library bibliography 167.

MLA

Gray NF, . Basic reference books for water pollution officers and staff (freshwater). Dublin: National Institute for Physical Planning and Construction Research. Library bibliography 167. 1982.