Siegel, Arthur
McGraw-Hill Ryerson, 1983
Buku Teks
Lower, Arthur R.M.
The Ryerson Press, 1952
Buku Teks
Siegel, Eric S.
John Wiley & Sons, 1987
Buku Teks
Lower, Arthur R.M.
Longmans, Green and Company, 1959
Buku Teks
Lower, Arthur R.M.
Longmans, Green and Company, 1958
Buku Teks