Alexandrescu, Vasile
Military Pub. House, 1985
Buku Teks
Fuller, John Frederick Charles, author
Funk and Wagnalls, 1955
Buku Teks
Deborin, G., author
Progress Publishers, 1979
Buku Teks
Gallagher, Matthew P., author
Frederick A. Preager, 1963
Buku Teks
Cambridge University Press, 2015
Buku Teks