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
general editor: Thomas McCracken ; contributing editor: Richard Walker ; foreword: John F. Morris
Lustre Press, 1999
Buku Referensi