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MLA
GRAF, ODNY INGEBORG. “Incidence of Stuttering among Twins.” Stuttering in Children and Adults: Thirty Years of Research at the University of Iowa, edited by WENDELL JOHNSON, by RALPH R. LEUTENEGGER, NED - New edition ed., University of Minnesota Press, Minneapolis, 1955, pp. 381–386, www.jstor.org/stable/10.5749/j.ctttv49c.36. Accessed 10 Aug. 2020.
APA
GRAF, O. (1955). Incidence of Stuttering among Twins. In LEUTENEGGER R. (Author) & JOHNSON W. (Ed.), Stuttering in Children and Adults: Thirty Years of Research at the University of Iowa (pp. 381-386). Minneapolis: University of Minnesota Press. Retrieved August 10, 2020, from www.jstor.org/stable/10.5749/j.ctttv49c.36
CHICAGO
GRAF, ODNY INGEBORG. "Incidence of Stuttering among Twins." In Stuttering in Children and Adults: Thirty Years of Research at the University of Iowa, edited by JOHNSON WENDELL, by LEUTENEGGER RALPH R., 381-86. Minneapolis: University of Minnesota Press, 1955. Accessed August 10, 2020. www.jstor.org/stable/10.5749/j.ctttv49c.36.

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