AIME. (1956). Transactions of the American Institute of mining and metalurgical engineers: Petroleum development and technology 1930/1931. Volume 82/92. Petroleum Branch.
Lua i Stíl Chicago (17ú heag.)AIME. Transactions of the American Institute of Mining and Metalurgical Engineers: Petroleum Development and Technology 1930/1931. Volume 82/92. Petroleum Branch, 1956.
Lua MLA (8ú heag.)AIME. Transactions of the American Institute of Mining and Metalurgical Engineers: Petroleum Development and Technology 1930/1931. Volume 82/92. Petroleum Branch, 1956.
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