Gray, Harry B.
"Berlin: Walter de Gruyter, 1973",
Buku Teks
Crelyn, R.J.
"Chichester: John Wiley & Sons, 1990",
Buku Teks
Wallwork, S.C.
"London: Longmans, 1960",
Buku Teks
Golden, Sidney
"Massachusetts: Addison-Wesley, 1961",
Buku Teks
Gilrearth, Esmarch S., author
McGraw-Hill, 1958
Buku Teks