Allendoerfer, Carl B., author
Macmillan, 1965
Buku Teks
Beckmann, Sybilla, author
Pearson Addison Wesley, 2008
Buku Teks
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks
Garstens, Helen L., author
Macmillan, 1969
Buku Teks
Thomas, David A.
Allyn and Bacon, 1991
Buku Teks