Boer, D. E. H. de
Wolters-Noordhoff, 1989
Buku Teks
Hoyt, Robert S., author
Harcourt, Brace & World, 1957
Buku Teks
Calmette, Joseph
Presses Universitaires de France, 1951
Buku Teks
Fremantle, Anne, author
Time Life International, 1965
Buku Teks
Storey, R.L., author
Simon & Schuster , 1994
Buku Referensi