Gaya APA
Gilley, J, W., Eggland, S, A. (1989).
Principles of human resource development .
Massachusetts:
Addison Wesley.
Gaya MLA
Gilley, Jerry, W.., Eggland, Steven, A..
"Principles of human resource development".
Massachusetts:
Addison Wesley,
1989.
Buku/Printed Material.