Judul asli : "The Skill of Communicating"
No Inv.: 2480/S/Perp/87/1c
No Inv.: 119152-119154/P/Perp/09/3c
No Inv.: 361/S/Perp/90/1c~307/YA/Perp/88/1c
No Inv.: 74505-74506/P/01/2c
No Inv.: 126962-126966/P/perp/10/5c~127632-127636/P/Perp/10/5c
Bibliografi : hlm. 265-268 No Inv.: 140824/Sm/Perp/14/1c
No Inv.: 8095-8099/P/Perp/92/5c~8164-8168/P/Perp/92/5c~773/S/Perp/91/1c~457/S/Perp/89/1c~1304/S/Perp/92/1c~76563/S/01/1c