Gaya APA

COMMISSION, M, S. (1986). Water pollution control (module 2 water pollution): work unit 2 types of water pollution . : Her Majesty's Stationary Office.

Gaya MLA

COMMISSION, MANPOWER, SERVICES. "Water pollution control (module 2 water pollution): work unit 2 types of water pollution". : Her Majesty's Stationary Office, 1986. Laporan.