Turner, GW
London Penguin Books 1973
Buku Teks
Menge, Herman, author
Berlin Langenscheidt 1961
Buku Referensi
Janos, author
Budapest Franklin 1902
Buku Referensi
Mehler, J., author
Groningen Wolters [t.th.]
Buku Referensi
Schmidt, K.
Wien Holder 1920
Buku Teks