APA (7th ed.) Citation

Abel, M., Burger, R., & Piraino, P. (2017). The Value of Reference Letters. World Bank, Washington, DC.

Chicago Style (17th ed.) Citation

Abel, Martin, Rulof Burger, and Patrizio Piraino. The Value of Reference Letters. World Bank, Washington, DC, 2017.

MLA (8th ed.) Citation

Abel, Martin, et al. The Value of Reference Letters. World Bank, Washington, DC, 2017.