Tischler, Henry L.
Wadsworth and Cengage Learning, 2014
Buku Teks
Mckee, James B.
Holt, Rinehart and Winston, 1969
Buku Teks
Gillin, John Lewis
Macmillan, 1942
Buku Teks
Gelles, Richard J.
McGraw-Hill College , 1999
Buku Teks
Bassis, Michael S.
McGraw-Hill, 1991
Buku Teks