Sykes, Egerton, author
London, J.M. Dent and Sons
Buku Referensi
Thomas, Joseph, author
Philadelphia : J.B. Lippincott, 1915
Buku Referensi
Gramedia Pustaka Utama, 2005
Buku Teks
Blakeney, E.H., author
J.M. Dent & Sons, 1952
Buku Referensi
Backman, Louise
Stockholm Almqvist & Wiksell International 1975
Buku Teks