by E. Wight Bakke [and others]
John Wiley & Sons, 1954
Buku Teks
Artikel Jurnal
Taira, Koji
Columbia University Press, 1970
Buku Teks
Moore, Wilbert E. (Wilbert Ellis), author
Cornell University Press , 1951
Buku Teks
McDiarmid, Orville John, author
John Hopkins University Press, 1977
Buku Teks