edited by Mary E. McGann
Ally & Bacon , 1992
Buku Referensi
Rainbolt, George W., author
Wadsworth and Cengage Learning, 2012
Buku Teks
Scharbach, Alexander, author
McGraw-Hill , 1965
Buku Teks
Hammond, Eugene R., author
McGraw-Hill, 1989
Buku Teks
Wolseley, Roland E., author
Chilton, 1959
Buku Teks