Robinson, Lois
Harper & Row , 1967
Buku Teks
Garner, Bryan A.
The University of Chicago Press, 2001
Buku Teks
Fries, Charles Carpenter
University of Michigan Press, 1951
Buku Teks SO
Scholastic, 1987
Buku Teks
Allen, Edward David, 1923-
Harcourt Brace Jovanovich, c1977
Buku Teks