Lua APA (7ú heag.)

GAFFERT, G. A. Steam power station. McGraw Hill Book.

Lua i Stíl Chicago (17ú heag.)

GAFFERT, Gustaf A. Steam Power Station. New York: McGraw Hill Book.

Lua MLA (9ú heag.)

GAFFERT, Gustaf A. Steam Power Station. McGraw Hill Book.

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