APA (7th ed.) Citation

Realuyo, Z. M., & Ilarde, I. d. P. (1982). Today's basic concepts in earth science. Goodwill Trading.

Chicago Style (17th ed.) Citation

Realuyo, Zenaida M., and Isabelina del Pan Ilarde. Today's Basic Concepts in Earth Science. Manila: Goodwill Trading, 1982.

MLA (9th ed.) Citation

Realuyo, Zenaida M., and Isabelina del Pan Ilarde. Today's Basic Concepts in Earth Science. Goodwill Trading, 1982.