Stauffer, Donald Alfred
Princeton University Press, 1941
Buku Teks
Spacks, Patricia Meyer
Wiley-Blackwell, 2009
Buku Teks
Anderson, M.S.
Longman, 1971
Buku Teks
Berkeley : The University of California
Majalah, Jurnal, Buletin
Richter, David H., 1945-
Wiley Blackwell, 2017
Buku Teks