Shipman, J. T., Wilson, J. D., & Todd, A. W. (1997). An introduction to physical science (8th ed.). Houghton Mifflin.
Cita Chicago (17th ed.)Shipman, James T., Jerry D. Wilson, i Aaron W. Todd. An Introduction to Physical Science. 8th ed. Boston: Houghton Mifflin, 1997.
Cita MLA (9th ed.)Shipman, James T., et al. An Introduction to Physical Science. 8th ed. Houghton Mifflin, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.