editor Thomas C. Cochran, Wayne Andrew
Charles Scribner's Sons , 1962
Buku Referensi
Walters, Morgan L
N.Y.Holt Rinehart and Winston,inc, 1966
Buku Teks
Walters, Margan L
N.Y.Holt,Rinehart and winston,ic, 1966
Buku Teks
Houghton Miffiln, 1981
Buku Referensi
editor Joseph G. E.Hopkins
Charles Scribner's Sons, 1964
Buku Referensi