Judul asli : "Effective Class Management : A practical Approach"
Judul asli ; "Water for health"
No Inv.: 2063-2067/P/Perp/96/5c~4752/P/Perp/97/1c~2528-2537/P/Perp/98/10c
No Inv.: 142388/P/Perp/14/1c
Bibliografi : hlm. 422
No Inv.: 132643/SM/Perp/12/1c~145116/SM/Perp/13/1c