Wallacem W. Stewart
Macmillan, 1945
Buku Teks
Wallace, W. Stewart
Macmillan, 1945
Buku Referensi
edited by Thomas M. Paikeday
Holt, Rinehart and Winston, 1976
Buku Referensi
Charles Scribner's Sons, 1964
Buku Referensi
editor Joseph G. E.Hopkins
Charles Scribner's Sons, 1964
Buku Referensi