Wallechinsky, David
Doubleday, 1975
Buku Referensi
Parents' Magazine's Cultural Institute, 1965
Buku Referensi
Americana Corporation, 1980
Buku Referensi
Stimpson, George
Harper and Brothers Publisher, 1946
Buku Referensi
Weideman, Hugh
Thomas Y. Crowell Company, 1958
Buku Referensi