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Altus, W. D. (1966). Birth order and Its sequelae. Science, 151, 44-49.
Capra, P. C., & Dittes, J. E. (1962). Birth order as a selective factor among volunteer subjects. Journal of Abnormal and Social Psychology, 55, 302.
MacDonald, A. P., Jr., (1972). Characteristics of volunteer subjects under three recruiting methods: pay, extra credit, and love of science. Journal of Consulting and Clinical Psychology, 39, 222-234.
Rosenbaum, M. E. (1956). The effect of stimulus and background factors on the volunteering response. Journal of Abnormal and Social Psychology, 53,, 118-121.
Rosenbaum, M. E., & Blake, R. R. (1955). Volunteering as a function of field structure. Journal of Abnormal and Social Psychology, 55, 193-196.
Rosenthal, R., & Rosnow, R. L. (1969). The volunteer subject. In R. Rosenthal and R. L. Rosnow (Eds.), Artifact in Social Research. New York: Academic press.
Suedfeld, P. (1964). Birth order of volunteers for sensory deprivation. Journal of Abnormal and Social Psychology,68, 195-196.
Ward, C. D. (1964). A further examination of birth order as a selective factor among volunteer subjects. Journal of Abnormal and Social Psychology, 69, 311-313.
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