Duchacek, Ivo D., author
Holt, Rinehart and Winston, 1965
Buku Teks
Nye, Joseph S., author
Essex Pearson, 2014
Buku Teks
Nye, Joseph S., author
Pearson, 2012
Buku Teks
Herz, John H.
David McKay, 1976
Buku Teks
edited by Astri Suhrkel and Lela Garner Noble
Frederick A. Praeger, 1977
Buku Teks