Cita APA (7th ed.)

Feather, R. M., Snyder, S. L., & T Hesser, D. (1993). Merrill earth science. McGraw-Hill.

Cita Chicago (17th ed.)

Feather, Ralph M., Susan Leach Snyder, i Dale T Hesser. Merrill Earth Science. New York: McGraw-Hill, 1993.

Cita MLA (8th ed.)

Feather, Ralph M., et al. Merrill Earth Science. McGraw-Hill, 1993.