Gerwick Jr., Ben C.
Boca Raton: CRC Press, 2000
Buku Teks
Gerwick, Ben C
CRC Pres, 2007
Buku Teks
Ben C. Gerwick
CRC Press,, 2007
Buku Teks
Ambrose, James E., author
John Wiley & Sons, c1979
Buku Teks
Quinn, Alonzo Def, author
McGraw-Hill, 1972
Buku Teks