Ryan, R. H., & Schifrin, L. G. (1959). Midland: The economic future of a Texas oil center. Bureau of Business Research. University of Texas.
Lua i Stíl Chicago (17ú heag.)Ryan, Robert H., agus Leonard G. Schifrin. Midland: The Economic Future of a Texas Oil Center. Austin: Bureau of Business Research. University of Texas, 1959.
Lua MLA (8ú heag.)Ryan, Robert H., agus Leonard G. Schifrin. Midland: The Economic Future of a Texas Oil Center. Bureau of Business Research. University of Texas, 1959.
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