MLA

Spiess-Knafl, Wolfgang, and Barbara Scheck. Impact Investing. Springer International Publishing, 2017.

APA

Spiess-Knafl, W., & Scheck, B. (2017). Impact Investing. Springer International Publishing.

Chicago

Spiess-Knafl, Wolfgang, and Barbara Scheck. Impact Investing. : Springer International Publishing, 2017.