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
Nort-Holland Publishing Company, 1973
Buku Teks
Bahm, Archie J., author
Student Outline Co. , 1960
Buku Teks