Judul asli : "The Extension Worker`s Companion and Reading Book"
No Inv.: 103216/PSM/Perp/05/1c~104275-104279/P/Perp/06/5c~108588-108590,108592/P/Perp/06/4c~109869/PH/Perp/07/1c~119931-119933/P/Perp/09/3c
No Inv.: 914-917/BD/Perp/86/4c
No Inv.: 111385-111388/P/Perp/08/4c~117632-117634/P/Perp/09/3c~120027-120029/P/Perp/09/3c
No Inv.: 53-054/BD/Perp/86/2c
No Inv.: 149/S/Perp/90/1c~220/S/Perp/88/1c~581/S/Perp/88/1c~306/S/Perp/88/1c~2247/S/Perp/88/1c~1047/S/Perp/90/1c~806-809/S/Perp/96/4c~77709-77710/S/01/2c
Bibliografi : hlm. 199-203 No Inv.: 135005/SM/Perp/13/1c
No Inv.: 200-201/BD/Perp/86/2c(R)~94/P/Perp/95/1c
No Inv.: 132574/PH/Perp/12/1c