Elledge, Jonn, author
Wildfire, 2024
Buku Teks
McNally, Rand, author
Rand McNally & Co, 1957
Buku Referensi
Kyung Hee University, 2008
Buku Referensi
edited by Geoffrey Barraclough
Times Books, 1984
Buku Referensi
edited by Edward Whiting Fox
Oxford University Press, 1957
Buku Teks