Cumming, James C.
Fairchild , 1955
Buku Teks
Ika Yulistyawati
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2010
UI - Tesis Open
Erizal Mahatama
Universitas Indonesia, 2009
UI - Tesis Open
Wingate, Isabel B. (Isabel Barnum)
Englewood Cliffs, NJ: Prentice-Hall, 1955
Buku Teks
edited by P. V. Vidyasagar
Mittal Publications, 2000
Buku Referensi