No Inv.: 1341-1345/P/Perp/98/5c
No Inv.: 3167-3176/P/Perp/97/10c
No Inv.: 985/S/Perp/90/1c~7634/S/01/1c~76552/S/01/1c
No Inv.: 68145-68147/S/00/3c
Judul asli : "Group Communication : Discussion Processes and Application"
No Inv.: 1192-1211/Perp/89/20c
No Inv.: 440-459/Perp/89/20c
No Inv.: 1302-1321/Perp/89/20c
No Inv.: 8315-8319/P/Perp/92/5c~655-664/P/Perp/95/10c~3206-3215/P/Perp/96/10c