Artikel Jurnal
Niles, Mary Cushing Howard
Harper & Brothers, 1940
Buku Teks
Jorgensen, Carolyn, author
Brandy, 1990
Buku Teks
by Daniel S. Cheever ... [et al.]
Addison-Wesley, 1986
Buku Teks
Glover, John Desmond, author
Richard D. Irwin, 1957
Buku Teks