Matsuo, Hiroshi
The Institute of Developing Economics , 1970
Buku Teks
Rambu Luba Kata Respati Nugrohohowardhani, author
YJP Press, 2014
Artikel Jurnal
Cox, Clifton B.
Harvard Univ.Graduate School of Business Administration Div. of Research , 1959
Buku Teks
Robson, R., author
Macmillan, 1957
Buku Teks
Hauser, William B., author
Cambridge University Press, 1974
Buku Teks