Treviño, Rose Zertuche, author
[American Management Association, ], 2009
eBooks
Fucilla, Joseph G., author
Follett Publishing Company, 1964
Buku Referensi
Eckersley, C. E. (Charles Ewart), 1892-1967, author
Longmans, Green and Co., 1953
Buku Referensi
London; Cassell LTD., 1978
Buku Referensi
Artikel Jurnal