Lua APA (7ú heag.)

Não informado. (2017). Petroleum Engineer. Petroleum Engineer Publications.

Lua i Stíl Chicago (17ú heag.)

Não informado. Petroleum Engineer. Dallas, Tex: Petroleum Engineer Publications, 2017.

Lua MLA (8ú heag.)

Não informado. Petroleum Engineer. Petroleum Engineer Publications, 2017.

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