APA Citation

Hubbard, R. G., & O'Brien, A. P. Essentials of economics (Sixth edition.).

Chicago Style Citation

Hubbard, R. Glenn, and Anthony Patrick O'Brien. Essentials of Economics. Sixth edition.

MLA Citation

Hubbard, R. Glenn, and Anthony Patrick O'Brien. Essentials of Economics. Sixth edition.

Warning: These citations may not always be 100% accurate.