Connors, Michael M., author
Pennsylvania International Textbook, 1967
Buku Teks
Cassady, C. Richard, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Hanssmann, Fred, author
John Wiley & Sons, 1962
Buku Teks
Springer Science+Business Media, 2015
eBooks
Heyman, Daniel P., author
McGraw-Hill, 1984
Buku Teks