edited by Gerald W. Whitted
Pan American World Airways, 1971
Buku Teks
edited by Gerald W. Whitted
Pan American Airways, 1963
Buku Teks
Barnes, Harry Elmer, author
Prentice Hall of India, 1966
Buku Teks
Pierce, Eleanor B.
Pan American Airways, 1965
Buku Teks
Ahern, Barnabas M., author
Fides, 1963
Buku Teks