Penfield, Elizabeth
Scott, Foresman and Company, 1985
Koleksi Publik
James D. Williams, editor
Wiley-Blackwell, 2009
Buku Teks
Luxemburg, Jan van
Peter lang, [date of publication not identified]
Buku Teks
Levin, Gerald
Harcourt, Brace & World, 1966
Buku Teks
Fowler, H. Ramsey
Little, Brown & Co., 1980
Buku Referensi