Leonard, Nelson J. (2006) More than a memoir. Xlibris Corporation, Bloomington, IN. ISBN 1-59926-791-8 http://resolver.caltech.edu/CaltechBOOK:2006.002

Bertini, Ivano and Gray, Harry B. and Lippard, Stephen J. and Valentine, Joan Selverstone (1994) Bioinorganic Chemistry. University Science Books, Mill Valley, CA. ISBN 0-935702-57-1 http://resolver.caltech.edu/CaltechBOOK:1994.002

Goddard, William A., III (1986) Nature of the Chemical Bond. California Institute of Technology, Pasadena, CA. (Unpublished) http://resolver.caltech.edu/CaltechBOOK:1986.001

Ballhausen, Carl J. and Gray, Harry B. (1980) Molecular electronic structures : an introduction. Benjamin/Cummings Publishing Company, Reading, MA. ISBN 0-8053-0452-5 http://resolver.caltech.edu/CaltechBOOK:1980.002

Dickerson, Richard E. and Gray, Harry B. and Haight, Gilbert P (1979) Chemical principles. Third edition. The Benjamin/Cummings Publishing Company, Inc., Menlo Park, CA. ISBN 0805323988 http://resolver.caltech.edu/CaltechBOOK:1979.001

Roberts, John D. and Caserio, Marjorie C. (1977) Basic Principles of Organic Chemistry, second edition. W. A. Benjamin, Inc., Menlo Park, CA. ISBN 0-8053-8329-8 http://resolver.caltech.edu/CaltechBOOK:1977.001

Roberts, John D. and Stewart, Ross and Caserio, Marjorie C. (1971) Organic chemistry: methane to macromolecules. W. A. Benjamin, Inc., New York, NY. ISBN 8053-8332-8 http://resolver.caltech.edu/CaltechBOOK:1971.001

Dence, Joseph B. and Gray, Harry B. and Hammond, George S. (1968) Chemical dynamics. W. A. Benjamin, Inc., New York, NY. http://resolver.caltech.edu/CaltechBOOK:1968.001

Langford, Cooper H. and Gray, Harry B. (1966) Ligand Substitution Processes. W. A. Benjamin, Inc., New York. http://resolver.caltech.edu/CaltechBOOK:1966.001

Ballhausen, Carl A. and Gray, Harry B. (1965) Molecular orbital theory: an introductory lecture note and reprint volume. Frontiers in Chemistry . W. A. Benjamin, Inc., New York, NY. http://resolver.caltech.edu/CaltechBOOK:1965.002

Gray, Harry B. (1965) Electrons and Chemical Bonding. W. A. Benjamin, Inc., New York. http://resolver.caltech.edu/CaltechBOOK:1965.003

Roberts, John D. (1961) Notes on Molecular Orbital Calculations. W. A. Benjamin. http://resolver.caltech.edu/CaltechBOOK:1961.001

Roberts, John D. (1961) An Introduction to the Analysis of Spin-Spin Splitting in High-Resolution Nuclear Magnetic Resonance Spectra. W. A. Benjamin. http://resolver.caltech.edu/CaltechBOOK:1961.002

Roberts, John D. (1959) Nuclear Magnetic Resonance: applications to organic chemistry. McGraw-Hill Series in Advanced Chemistry . McGraw-Hill Book Company, Inc. http://resolver.caltech.edu/CaltechBOOK:1959.001