Osgood, Charles E. (Charles Egerton)
University of Illinois Press, 1975
Buku Teks
Dray, William H.
Prentice-Hall, 1993
Buku Teks
Desmonde, William H.
Prentice-Hall, 1964
Buku Teks
Greene, William H.
Pearson Education, 2003
Buku Teks
Bolen, William H.
Prentice Hall International, 1988
Buku Teks