Lorenzo, Barbara De, author
W.B. Saunders, 1985
Buku Referensi
Drake, Ellen, author
Saunders Elsevier, 2012
Buku Referensi
Gan, Linda, author
Foreign languages Press; San Francisco, CA. Long River Press, 2009
Buku Referensi
Gruber, Edward
Arc Books, 1963
Buku Teks
Hamilton, Mark, author
Neo-tech books, 2000
Buku Teks