Ross, Murray G., author
Harper & Row , 1967
Buku Teks
Manajemen Usahawan Indonesia, XXXII (04) April 2003: 21-27, 2003
Artikel Jurnal
Dunham, Arthur, author
Thomas Y Crowell, 1962
Buku Teks
Ross, Murray G., author
Harper & Row, 1955
Buku Teks
selected and edited by Ermest B. Harper and Arthur Dunham
Association Press, 1966
Buku Teks