Sunico, R. C., & De Leon, J. (1990). Two friends, one world. Cacho Pub. House.
Cita Chicago Style (17a ed.)Sunico, Ramon C., y Joanne De Leon. Two Friends, One World. Mandaluyong, Metro Manila: Cacho Pub. House, 1990.
Cita MLA (9a ed.)Sunico, Ramon C., y Joanne De Leon. Two Friends, One World. Cacho Pub. House, 1990.
Precaución: Estas citas no son 100% exactas.