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