Why? people : Jane Goodall

 Novianti, Endah Nawang;

Jakarta : Elex Media Komputindo , 2014

Why? people : Stephen Hawking

 Novianti, Endah Nawang;

Jakarta : Elex Media Komputindo , 2014

Why? fossil

 Lee, Kwang; Woong; Huda, Khoirul; Citra, Irene;

Jakarta : Elex Media Komputindo , 2009

Why? warisan dunia

 Youngseon, Cho; Hestiningsih, Puji;

Jakarta : Elex Media Komputindo , 2014

Why? simbiosis dan musuh alami

 Novianti, Endah Nawang; Saejoon, Park;

Jakarta : Elex Media Komputindo , 2014

Why? angka dan matematika

 Novianti, Endah Nawang; Youngseon Jo;

Jakarta : Elex Media Komputindo , 2014