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Buku Teks
Jones, Frank H., author
W. Heffer & Sons, 1972
Buku Teks
Siti Masitoh, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)
Parker, R.H.
Penguin Books, 1972
Buku Teks
Brownlee, E. Richard, author
McGraw-Hill, 2001
Buku Teks