Kohler, Heonz
Healt and Company , 1992
Buku Teks
Kohler, Heinz, 1934-
Dryden Press, 1970
Buku Teks
edited by K. William Kapp, Lore L. Kapp
Barnes & Noble, 1949
Buku Teks
edited by Thomas J. Anderson, Abraham L. Gitlow and Daniel E. Diamond
Richard D. Irwin, 1959
Buku Teks
Isaacs, Asher, 1902-1963, author
Dryden Press, 1952
Buku Teks