Malenab, R. G., Catchillar, G. C., Vibal, P. S., & Martinez, F. B. (2006). Essentials of physical science: (worktext). Rex Book Store.

Malenab, Ryan G., Gerry C. Catchillar, Pablito S. Vibal, and Felipe B. Martinez. Essentials of Physical Science: (worktext). Manila: Rex Book Store, 2006.

Malenab, Ryan G., et al. Essentials of Physical Science: (worktext). Rex Book Store, 2006.