Ассоциация американских ветеринаров, статистика рыночного исследования 2001 г.

A. J. Lafley & Ram Charan, The Game Changer: How You Can Drive Revenue and Profit Growth with Innovation (New York: Crown Business, 2008).

Более подробно об исследованиях Вольфрама Шульца см.: “Behavioral Theories and the Neurophysiology of Reward”, Annual Review of Psychology 57 (2006): 87–115; Wolfram Schultz, Peter Dayan, & P. Read Montague, “A Neural Substrate of Prediction and Reward”, Science 275 (1997): 1593–99; Wolfram Schultz, “Predictive Reward Signal of Dopamine Neurons”, Journal of Neurophysiology 80 (1998): 1–27; L. Tremblya & Wolfram Schultz, “Relative Reward Preference in Primate Orbitofrontal Cortex”, Nature 398 (1999): 704–8; Wolfram Schultz, “Getting Formal with Dopamine and Reward”, Neuron 36 (2002): 241–63; W. Schultz, P. Apicella, & T. Ljungberg, “Responses of Monkey Dopamine Neurons to Reward and Conditioned Stimuli During Successive Steps of Learning a Delayed Response Task”, Journal of Neuroscience 13 (1993): 900–913.