Okada, Yuzuru
Japan Travel Bureau, 1953
Buku Teks
Mills, Harry
[American Management Association, ], 2004
eBooks
Spotte, Stephen
John Wiley & Sons, 1973
Buku Teks
Herrick, Glenn W. (Glenn Washington), 1870-1965
Comstock Publishing Company, 1935
Buku Teks
Burkhart, Harold E.
[Springer, Springer], 2012
eBooks