Ludvigsen, Karl E., author
Bentley Publishers, 2015
Buku Teks
Hardy, Frank
Gold Star Publication, 1971
Koleksi Publik
Bailey, Stephen K., author
Columbia University Press, 1950
Buku Teks
Bailey, Stephen K., author
Colombia University Press, 1951
Buku Teks
Hardy, Frank
Gold Star Publication, 1971
Buku Teks