bibliografi hlm. 185-187.
Bibliografi hlm. 116-117.
Judul asli : Maximazing your child intelligence through language and imagination. Bibliografi; hlm.177.
Bibliografi hlm. 40.
Bibliografi: hlm. 230-236.
Judul Asli: Educational patterns in contemporary societies. Bibliografi: hlm. 724-725.