Walker, Bryce S.
The Rocky Mountains
Time-Life Books, 1973
 Buku Teks SO
Gibb, Hamilton A.R., Sir
Ibn Battuta travels in Asia and Africa 1325-1354
London, Routledge & Kegen Paul, 1957
 Buku Teks
Wallace, Robert
Hawaii
Amsterdam Time Life 1974
 Buku Teks
Kaplan, Robert D.
Eastward to tartary: travels in the balkans, the middle east, and the caucasus
Random House, 2000
 Buku Teks
Walker, Von Bryce S
Die Rocky mountains/Von bryce S. Walker
Die Wildnisse Der welt, 1973
 Buku Teks SO