Schwab, Victor O
Wilshire Book Company, 1962
Buku Teks
Burton, Philip Ward, 1910-, author
Grid Publishing, 1978
Buku Teks
Burton, Philip Ward, 1910-, author
NTC Business Book, 1991
Buku Teks
Clarke, George Timothy
New York University, 1959
Buku Teks
Agustrijanto, author
PT Remaja Rosdakarya, 2002
Buku Teks