Bollinger, Lee C.
Oxford University Press, 2010
Buku Teks
Paneth, Donald
Facts on File, 1983
Buku Referensi
Kovach, Bill
Three Rivers Press, 2014
Buku Teks
Cohen, Bernard Cecil, 1926-
Princeton University Press, 1969
Buku Teks SO
Chafee, Zechariah
The University of Chicago Press, 1947
Buku Teks