Hurley, Patrick J., 1883-1963, author
Wardsworth Cengage Learning, 2012
Buku Teks
Langer, Susanne, author
Dover, 1967
Buku Teks
Langer, Susanne K., author
Dover, 1953
Buku Teks
Tidman, Paul, author
Wadsworth, 1999
Buku Teks
Hausman, Alan, author
Wadsworth and Cengage Learning, 2013
Buku Teks