Bibliografi : hlm. 471-477
No Inv.: 1067/P/Perp/95/1c
No. Inv. : 146060/S/Perp/15/1c
Bibliografi : hlm. 346-347
No Inv.: 140456/Sm/Perp/14/1c
No Inv.: 248/AF/Perp/91/1c~469/AF/Perp/91/1c~109649-109650/PH/Perp/07/2c
Judul asli : "Group Communication : Discussion Processes and Application"
No Inv.: 303/S/Perp/90/1c~860/S/Perp/88/1c~208/S/Perp/89/1c~2172-2176/S/Perp/92/5c~771/S/Perp/93/1c~85583/S/Perp/1c~120438/SM/Perp/09/1c