Cita APA (7th ed.)

Water Pollution Control Federation. (1981). WPCF wasterwater treatment skill training package: Anaerobic digestion administration guide. Water Pollution Control Federation.

Cita Chicago (17th ed.)

Water Pollution Control Federation. WPCF Wasterwater Treatment Skill Training Package: Anaerobic Digestion Administration Guide. Washington, D.C: Water Pollution Control Federation, 1981.

Cita MLA (9th ed.)

Water Pollution Control Federation. WPCF Wasterwater Treatment Skill Training Package: Anaerobic Digestion Administration Guide. Water Pollution Control Federation, 1981.