edited by Alan Gilbert
John Wiley & Sons, 1978
Buku Teks
Baldwin, George B. (George Benedict), 1920-, author
John Hopkins Press, 1967
Buku Teks
Hicks, Ursula K., author
Clarendon Press, 1969
Buku Teks
Willmore, Joe, author
[American Society for Training and Development Press;American Society for Training and Development Press, American Society for Training and Development Press], 1998
eBooks
American Society of Civil Engineers, 2018
Majalah, Jurnal, Buletin