Rand McNally, editor
Time-Life Books, 1968
Buku Referensi
Hammond, author
Hammod Incorproted, 1986
Buku Referensi
Foreword by William R. Mead
Tiger Book International, 1995
Buku Referensi
Kidron, Michael, author
Simon & Schuster, 1984
Buku Teks
The George F. Cram, 1952
Buku Referensi