APA (7e ed.) Bronvermelding

Water Pollution Control Federation. (1980). WPCF extended aeration skill training program - student workbook. The Federation.

Chicago (17e ed.) Bronvermelding

Water Pollution Control Federation. WPCF Extended Aeration Skill Training Program - Student Workbook. Washington, D.C.: The Federation, 1980.

MLA (9e ed.) Bronvermelding

Water Pollution Control Federation. WPCF Extended Aeration Skill Training Program - Student Workbook. The Federation, 1980.