Knowles, Asa S., author
Macmillan, 1943
Buku Teks
Departemen Perburuhan R.I., 1963
Buku Teks
Thomson, George F., author
Institute of Personeel Management, 1975
Buku Teks
Riani Rachmawati, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1999
UI - Skripsi Membership
Lynch, James J., author
Pan Books, 1972
Buku Teks