edited by Joseph Seibert & Gorden [i.e. Gordon] Wills
Penguin Books, 1970
Buku Referensi
Adler, Max K.
Crosby Lockwood & Sons, 1965
Buku Teks
Lehmann, Donald R.
Richard D. Irwin, 1989
Buku Teks
Lehmann, Donald R.
Richard D. Irwin, 1979
Buku Teks
Holmes, Parker M.
South-Western Publishing Co., 1960
Buku Teks