Lloyd M. Mark, Day J. Jeremy, & Ur P. Penny. (2011). Active Grammar: Level 3 with answers. Cambridge, Cambridge University Press, 2011.
Chicagoスタイル(17版)引用形式Lloyd M. Mark, Day J. Jeremy, , Ur P. Penny. Active Grammar: Level 3 with Answers. Cambridge, Cambridge University Press, 2011, 2011.
MLA(9版)引用形式Lloyd M. Mark, et al. Active Grammar: Level 3 with Answers. Cambridge, Cambridge University Press, 2011, 2011.
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