PUFFETT, R. (1986). Plumbing Services Volume 3, Gas Fitting Rj Puffett, Lj. Hossack. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)PUFFETT, RJ. Plumbing Services Volume 3, Gas Fitting Rj Puffett, Lj. Hossack. McGraw-Hill, 1986.
Lua MLA (8ú heag.)PUFFETT, RJ. Plumbing Services Volume 3, Gas Fitting Rj Puffett, Lj. Hossack. McGraw-Hill, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.