Friedman, Lawrence M., 1930-, author
Tatanusa, 2001
Buku Teks
Hallenbeck, Wilbur C., author
Harper & Brothers , 1951
Buku Teks
Charles Scribner's Sons, 1964
Buku Referensi
Adams, James Truslow, author
1946
Buku Referensi
editor Thomas C. Cochran, Wayne Andrew
Charles Scribner's Sons , 1962
Buku Referensi