Australian Industrial Relations Commission, Australian Conciliation and Arbitration Commission (1993). Commonwealth Arbitration Reports. Vol. 7. Australian Government Pub. Service. p. 345.
doi.org
Cialdini, R.B.; Cacioppo, J.T.; Bassett, R.; Miller, J.A. (1978). "Low-ball procedure for producing compliance: Commitment then cost". Journal of Personality and Social Psychology. 36 (5): 463–476. doi:10.1037/0022-3514.36.5.463.