Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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