Siegel, Laurence
Richard D. Irwin, 1968
Buku Teks SO
Ghiselli, Edwin E.
McGraw-Hill, 1955
Buku Teks
edited by Harry W. Karn and B. von Haller Gilmer
McGraw-Hill, 1962
Buku Teks
edited by Harry W. Karn, B. von Haller Gilmer
McGraw-Hill, 1962
Buku Teks
Ryan, Thomas A.
Ronald Press, 1954
Buku Teks