APA
Plumbing-Heating-Cooling Contractors--National Association (U.S.). Educational Foundation Plumbing Apprentice & Journeyman Training Committee, . (2009). Plumbing 201. Australia ; United States: Delmar Cengage Learning.
Chicago
Plumbing-Heating-Cooling Contractors--National Association (U.S.). Educational Foundation Plumbing Apprentice & Journeyman Training Committee, . 2009. Plumbing 201. Australia ; United States: Delmar Cengage Learning.
Harvard
Plumbing-Heating-Cooling Contractors--National Association (U.S.). Educational Foundation Plumbing Apprentice & Journeyman Training Committee, . (2009). Plumbing 201. Australia ; United States: Delmar Cengage Learning.
MLA
Plumbing-Heating-Cooling Contractors--National Association (U.S.). Educational Foundation Plumbing Apprentice & Journeyman Training Committee, . Plumbing 201. Australia ; United States: Delmar Cengage Learning. 2009.