edited by E. F. Bozman
J. M. Dent & Sons, 1958
Buku Referensi
Burnison, Gary, 1961-, author
McGraw-Hill, 2012
Buku Teks
by Francis Bacon [and others]; edited by Burton L. Cooper
Holt. Reinhart and Winston,
Buku Teks
Mathis, Ayana, author
Alfred A. Knopf, 2012
Buku Teks
Stevenson, Leslie Forster, author
Oxford University Press, 2012
Buku Teks