Mills, Daniel Quinn, author
McGraw-Hill, 1994
Buku Teks
Roberts, Harold S.
University of Hawaii Press, 1970
Buku Teks
Artikel Jurnal
Herrick, Neal Q., author
Jossey-Bass, 1990
Buku Teks
by Clark Kerr ... [et al.]
Oxford University Press, 1964
Buku Teks