foreword by Emrys Jones
Octopus Books, 1978
Buku Referensi
edited by Gerald W. Whitted
Pan American World Airways, 1971
Buku Referensi
edited by Gerald W. Whitted
Pan American World Airways, 1963
Buku Referensi
Snibbe, Patricia M., author
McGraw-Hill, 1999
Buku Teks
Kidron, Michael, author
Simon & Schuster, 1984
Buku Teks