Meier, Richard, author
Rizzoli, 1999
Buku Teks
Frye, Richard N.
Henry Holt and Company, 1953
Buku Teks
Frye, Richard N.
Allen & Unwin , 1960
Buku Teks
Tregaskis, Richard
Holt, Rinehart and Winston, 1963
Buku Teks
Taylor, Richard
Englewood Cliffs : A Simon & Schuster, 1992
Buku Teks