Victor, Edward
Macmillan, 1966
Buku Teks
Blough, Glenn O.
Holt, Rinehart and Winston, 1964
Buku Teks
Huck, Charlotte S.
McGraw-Hill, 2004
Buku Teks
Phares Odaffer, Randall Charles, Thomas Cooney, John Dossey, Jane Schielack
Pearson Addison Wesley, 2008
Buku Teks
Garstens, Helen L.
Macmillan, 1969
Buku Teks