Wellington, C. Oliver
New York, N.Y. Nostrand 1948,
Buku Teks
Williangton, C. Oliver
D. Van Nostrand Co., 1956
Buku Teks
Wellington, C. Oliver
van Nostrand, Comp., Inc , 1960
Buku Teks
Staples, Frederick
The Counting House Publishing , 1938
Buku Teks
Adhi Indrawan, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1981
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