Compiled and edited by Dorothy Nyren Curley, Maurice Kramer, Elaine Fialka Kramer
Continuum, 1989
Buku Referensi
Crawford, Bartholow V.
Barnes & Noble, 1953
Buku Teks SO
Abel, Darrel
Barron's Educational Series, 1963
Buku Referensi
Duke University Press,
Majalah, Jurnal, Buletin
compiled by Ronald Gottesman ... [and others]
W.W. Norton, 1989
Buku Teks SO