Firth, Raymond, author
Thomas Nelson and Sons, 1945
Buku Teks
Firth, Raymond, author
The New American Library, 1958
Buku Teks
Firth, Raymond, author
Thomas Nelson and Sons, 1947
Buku Teks
Firth, Raymond, author
Thomas Nelson and Sons, 1950
Buku Teks
Gillin, John Philip, author
University of Pittsburgh Press, 1969
Buku Teks