Bibliografi : hlm. 323-328 No Inv.: 143292-143296/P/Perp/14/3c
Bibliografi : hlm. 109 No Inv.: 141014/PSM/Perp/14/1c
No Inv.: 140580/SM/Perp/14/1c
Judul asli : "The Skill of Communicating"
No Inv.: 361/S/Perp/90/1c~307/YA/Perp/88/1c
Bibliografi : hlm. 309-329
Bibliografi : hlm. 479-486
Bibliografi : hlm. 381-385
Bibliografi : hlm. 195-202
Bibliografi : hlm. 333-335 No Inv.: 141406-141410/P/Perp/14/5c