APA (7th ed.) Citation

Salvador, M. S., & Espiritu, I. (2013). When zero left number land. Adarna House.

Chicago Style (17th ed.) Citation

Salvador, Maita Songco, and Iori Espiritu. When Zero Left Number Land. Quezon City: Adarna House, 2013.

MLA (9th ed.) Citation

Salvador, Maita Songco, and Iori Espiritu. When Zero Left Number Land. Adarna House, 2013.

Warning: These citations may not always be 100% accurate.