Hill, J. W., & Hill, C. S. (1992). Chemistry for changing times (6th ed.). Macmillan Pub. Co.
Cita Chicago (17th ed.)Hill, John William, i Cynthia S. Hill. Chemistry for Changing Times. 6th ed. New York: Macmillan Pub. Co, 1992.
Cita MLA (9th ed.)Hill, John William, i Cynthia S. Hill. Chemistry for Changing Times. 6th ed. Macmillan Pub. Co, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.