Behrman, Jack N., author
Oelgeschlager, Gunn & Gunn & Hain , 1980
Buku Teks
Schikele, Rainer, author
McGraw-Hill, 1954
Buku Teks
Hall, Ford P.
McGraw-Hill Book Company , 1949
Buku Teks
Kanter, Rosabeth Moss
Simon & Schuster, 1995
Buku Teks
Behrman, Jack N., author
Prentice-Hall, 1970
Buku Teks