APA Publications , 2007
Buku Referensi
edited by Gerald W. Whitted
Pan American World Airways, 1971
Buku Teks
edited by Gerald W. Whitted
Pan American Airways, 1963
Buku Teks
edited by Gerald W. Whitted
Pan American World Airways, 1971
Buku Referensi
edited by Gerald W. Whitted
Pan American World Airways, 1963
Buku Referensi