Cite
Age and Ultimate Attainment in the Pronunciation of a Foreign Language.
MLA
Bongaerts, Theo, et al. “Age and Ultimate Attainment in the Pronunciation of a Foreign Language.” Studies in Second Language Acquisition, vol. 19, no. 4, Jan. 1997, pp. 447–65. EBSCOhost, widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=eric&AN=EJ555593&authtype=sso&custid=ns315887.
APA
Bongaerts, T., van Summeren, C., Planken, B., & Schils, E. (1997). Age and Ultimate Attainment in the Pronunciation of a Foreign Language. Studies in Second Language Acquisition, 19(4), 447–465.
Chicago
Bongaerts, Theo, Chantal van Summeren, Brigette Planken, and Erik Schils. 1997. “Age and Ultimate Attainment in the Pronunciation of a Foreign Language.” Studies in Second Language Acquisition 19 (4): 447–65. http://widgets.ebscohost.com/prod/customlink/proxify/proxify.php?count=1&encode=0&proxy=&find_1=&replace_1=&target=https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&scope=site&db=eric&AN=EJ555593&authtype=sso&custid=ns315887.