DWI Fajar Ratri. (2011). Buku Pintar Matematika (Basic). Jakarta: Bestari Kids.
Dyfyniad Arddull ChicagoDWI Fajar Ratri. Buku Pintar Matematika (Basic). Jakarta: Bestari Kids, 2011.
Dyfyniad MLADWI Fajar Ratri. Buku Pintar Matematika (Basic). Jakarta: Bestari Kids, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.