Mont, Francis M Du
Barnes & Noble , 1947
Buku Teks
Young-Key, author
Routledge, 2009
Buku Teks
House, C. Homer, author
Prentice-Hall, 1950
Buku Teks
Kapliwatzky, Jochanan, author
Rubin Mass, 1954
Buku Referensi
Lusin, Natala
Baron's Education, 1992
Buku Referensi