PUFFETT, R. (1986). Plumbing Services Volume 3, Gas Fitting Rj Puffett, Lj. Hossack. McGraw-Hill.
Chicago-viite (17. p.)PUFFETT, RJ. Plumbing Services Volume 3, Gas Fitting Rj Puffett, Lj. Hossack. McGraw-Hill, 1986.
MLA-viite (8. p.)PUFFETT, RJ. Plumbing Services Volume 3, Gas Fitting Rj Puffett, Lj. Hossack. McGraw-Hill, 1986.
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