APA (7th ed.) Citation

Hehre, W. J. (1998). A brief guide to molecular mechanics and quantum chemical calculations. Wavefunction.

Chicago Style (17th ed.) Citation

Hehre, Warren J. A Brief Guide to Molecular Mechanics and Quantum Chemical Calculations. Irvine, CA: Wavefunction, 1998.

MLA (9th ed.) Citation

Hehre, Warren J. A Brief Guide to Molecular Mechanics and Quantum Chemical Calculations. Wavefunction, 1998.