Kooistra, J.
Wolters, 1948
Buku Teks
edited by Ian Ousby
Cambridge University Press, 1993
Buku Referensi
Watt, Homer A.
Scott, Foresman, 1932
Buku Teks
Watt, Homer A.
Scott, Foresman, 1932
Buku Teks
Collier, WIlliam Francis
Thomas Nelson and Son, 1920
Buku Teks