APA (7th ed.) Citation

Hudelson, S., & Rigg, P. U. (1987). Hopscotch: Course book : level four.

Chicago Style (17th ed.) Citation

Hudelson, Sara, and Pat Urzúa Rigg. Hopscotch: Course Book : Level Four. New York, 1987.

MLA (9th ed.) Citation

Hudelson, Sara, and Pat Urzúa Rigg. Hopscotch: Course Book : Level Four. 1987.