Knack, Stephen and Zak, Paul J. (2001): Building trust: public policy, interpersonal trust and economic development. Published in: Supreme Court Economic Review , Vol. 10, (2002): pp. 91-107.
Zak, Paul J.; Stanton, Angela A. and Ahmadi, Sheila (2007): Oxytocin Increases Generosity in Humans. Published in: PloS ONE , Vol. e1128, No. 11 (07. November 2007): pp. 1-5.
