Cita APA (7a ed.)
United States Plumbing & Heating & A/C Contractors Industry Report. C. Barnes & Co.
Cita Chicago Style (17a ed.)
United States Plumbing & Heating & A/C Contractors Industry Report. C. Barnes & Co.
Cita MLA (9a ed.)
United States Plumbing & Heating & A/C Contractors Industry Report. C. Barnes & Co.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.