Gaia: BSH
Gaia: Penguin yearbook
Egilea: Obrien, Derek ed
Antzeko izenburuak: Penguin yearbook 2009
- Manorama yearbook 2011
- Manorama yearbook 2012
- Barron's TOEFL IBT interint-based test 2009
- Gk with Derek the ultimate general knowledge and quiz compendium: 1 history and geography
- Gk with derek the ultimate general knowledge and quiz com ndium : 2 business
- Gk with derek the ultimate general knowledge and quiz compendium :3 science and wildlife