Dickenson pub, 1969
Buku Teks
Vercelloni, Matteo, author
Edizioni L'archivolto, 1996
Buku Referensi
Chard, Chester S.
McGraw-Hill, 1975
Buku Teks
Jonathan Darling, Helen F. Wilson
Routledge, Taylor & Francis Group, 2016
Buku Teks
Academic Press, 1984
Buku Teks