Goulding, Christina
Sage, 2002
Buku Teks
Glaser, Barney G.
Aldine, 1967
Buku Teks
Howard, Keith
MCB University Press, 1990
Buku Referensi
Mohrman, Susan Albers
Berrett-Koehler, 2011
Buku Teks
edited by Joseph F. McCloskey, Florence N. Trefethen
John Hopkins Press, 1954
Buku Teks