Ontario Institute for Studies in Education & Harley, B. (1990). The Development of second language proficiency. Cambridge University Press.
芝加哥风格引文Ontario Institute for Studies in Education 与 Birgit Harley. The Development of Second Language Proficiency. Cambridge ; New York: Cambridge University Press, 1990.
MLA引文Ontario Institute for Studies in Education 与 Birgit Harley. The Development of Second Language Proficiency. Cambridge University Press, 1990.
警告：这些引文格式不一定是100％准确.