Judul asli : "Teaching Elementary School Mathematics for Understanding"
No Inv.: 942/P/Perp/95/1c~2560/P/Perp/95/1c
No Inv.: 134656/SM/Perp/13/1c~14115/PSM/Perp/14/1c
Bibliografi : hlm. 164-165
Bibliografi : hlm. 405-414 No Inv.: 137624-137627,135068/P/Perp/14/5c
Bibliografi : hlm. 123-125 No Inv.: 132293/SM/Perp/12/1c
Judul Asli : Basic Montessori, Learning Activities for Under-Fives. Bibliografi : hlm. 376-377
Bibliografi : hlm. 385-388No Inv.: 135731/SM/Perp/14/1c
Bibliografi : hlm. 337-338