Norstog, Knut, author
Northern Illinois University, 1969
Buku Teks
Gallwey, Timothy Josep, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Sousa, John J., author
Rhode Island Consortium, 1990
Buku Teks
Harley, John P., author
McGraw-Hill Book, 2000
Buku Teks
Semishin, Vasilii Ivanovich
Peace, [date of publication not identified]
Buku Teks