Williamson, Oliver E., author
Markham, 1967
Buku Teks
Grimshaw, Austin
McGraw-Hill, 1960
Buku Teks
edited by by Harold J. Leavitt and Louise R. Pondy
University of Chicago Press, c1964
Buku Teks
edited by Harold J. Leavitt and Louis R. Pondy
University of Chicago Press, 1964
Buku Teks
Savage, Christopher I., author
Hutchinson, 1975
Buku Teks