Gaya APA

The Handbook for waterworks operator certification / Frank R. Spellman : Joanne E. Drinan. (2001). : Lancaster : Technomic Publishing Company, Inc.

Gaya MLA

The Handbook for waterworks operator certification / Frank R. Spellman : Joanne E. Drinan. . : Lancaster : Technomic Publishing Company, Inc, 2001. Text.