Hoyt, Edwin C.
Martinus Nijhoff , 1959
Buku Teks
Lowfnberg, Edwin C
McGraw-Hill Company, 1967
Buku Teks
Roberts, Kate Louise, compiler
Grosset and Dunlap , 1940
Buku Referensi
Hoyt, Robert S., author
Harcourt, Brace & World, 1957
Buku Teks
Hoyt, Joseph Bixby.
Prentice-Hall, 1973
Buku Teks