Belot, BJ
Beyrouth Imprimerie Catholique 1951
Buku Referensi
Wichman, Karl, author
Philadelphia, David McKay Company, 1944
Buku Referensi
Wessely, J.E., author
Chicago dsb. Pollett Publ. 1946
Buku Referensi
London, 1982
Buku Referensi
Breul, Karl, author
Boston D.C. Heath 1936
Buku Referensi