edited by Gerald W. Whitted
Pan American World Airways, 1971
Buku Referensi
edited by John Lyons
Penguin Books, 1973
Buku Teks SO
edited by Gerald W. Whitted
Pan American World Airways, 1963
Buku Referensi
edited by Fan-Gang Zeng, Arthur N. Popper and Richard R. Fay
Springer, 2011
eBooks
Ahern, Barnabas M.
Fides, 1963
Buku Teks SO