Artikel Jurnal
Dewhurst, J. Frederic
Twentieth Century Fund, 1955
Buku Teks
Dewhurst, J. Frederic, author
Twentieth Century Fund, 1955
Buku Teks
Johson, Ben
Blummer and Clevedand-Row, 1861
Buku Teks
edited by George J. Halasi-ku
Pergamon Press, 1984
Buku Teks