APA (7th ed.) Citation

Oxford scholarship online (Online service), Emmons, R. A., & McCullough, M. E. (2004). The psychology of gratitude. Oxford University Press. https://doi.org/10.1093/acprof:oso/9780195150100.001.0001

Chicago Style (17th ed.) Citation

Oxford scholarship online (Online service), Robert A. Emmons, and Michael E. McCullough. The Psychology of Gratitude. Oxford: Oxford University Press, 2004. https://doi.org/10.1093/acprof:oso/9780195150100.001.0001.

MLA (9th ed.) Citation

Oxford scholarship online (Online service), et al. The Psychology of Gratitude. Oxford University Press, 2004. https://doi.org/10.1093/acprof:oso/9780195150100.001.0001.