APA (7e ed.) Bronvermelding

Spellman, F. R., & Drinan, J. E. (2001). The handbook for waterworks operator certification. Technomic.

Chicago (17e ed.) Bronvermelding

Spellman, Frank R., en Joanne E. Drinan. The Handbook for Waterworks Operator Certification. Lancaster, Penn: Technomic, 2001.

MLA (9e ed.) Bronvermelding

Spellman, Frank R., en Joanne E. Drinan. The Handbook for Waterworks Operator Certification. Technomic, 2001.