Galston, Arthur W.
Prentice-Hall, 1968
Buku Teks
Smith, C. Michael
Springer, 2005
Buku Teks
Agrios, George N.
Academic Press, 1988
Buku Teks
Yasseen, Leonard C.
New York, NY, American Research Council
Buku Teks SO
Salisbury, Frank B.
Wadsworth, 1985
Buku Referensi