Bibliografi : hlm. 249-251 No Inv.: 135414/SM/Perp/13/1c
Bibliografi:mklm, 481-483
Bibliografi : hlm. 731-734
Judul asli : "Introduction to Work Study"
No Inv.: 135120/PH/Perp/13/1c
Judul asli: "The differentiated workforce transforming talent into strategic impact"
Bibliografi : hlm. 269 - 273