Paneth, Donald
Facts on File, 1983
Buku Referensi
Wolfe, Tom, editor
Harper & Row Publishers, 1973
Buku Teks SO
Bollinger, Lee C.
Oxford University Press, 2010
Buku Teks
Kovach, Bill
Three Rivers Press, 2014
Buku Teks
Cohen, Bernard Cecil, 1926-
Princeton University Press, 1969
Buku Teks