Cortada, James W., author
McGraw-Hill, 2000
Buku Referensi
edited by Kirsten Malmkjær
Routledge, 2004
Buku Referensi
edited by William Dodge Lewis, Henry Seidel Canby, Thomas Kite Brown
John C. Winston, 1942
Buku Referensi
Wright, Samson, author
Oxford University Press, 1928
Buku Referensi
Wright, Samson, author
Oxford University Press, 1940
Buku Referensi