See Allo

Gaus, John M., author

Russell And Russell, 1967

Buku Teks

Pfiffner, John M., author

Ronald Press, 1960

Buku Teks

edited by Robert T. Golembiewski, Frank Gibson, Geoffrey Y. Cornog

Rand McNally College, 1972

Buku Teks

Simon, Herbert A., author

Alfred A. Knopf, 1973

Buku Teks

Denhardt, Robert B., author

Harcourt College, 1999

Buku Teks

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