Mortenson, W. P., Krider, D. T., & Sampson, R. J. (1967). Understanding our economy: Analysis, issues, principles ([Teacher's ed.].). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Mortenson, W. P., Donald T. Krider, agus Roy J. Sampson. Understanding Our Economy: Analysis, Issues, Principles. [Teacher's ed.]. Boston: Houghton Mifflin, 1967.
Lua MLA (8ú heag.)Mortenson, W. P., et al. Understanding Our Economy: Analysis, Issues, Principles. [Teacher's ed.]. Houghton Mifflin, 1967.
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