LEARNING DEMOCRATICALLY:USING STUDY CIRCLES
STURLA BJERKAKER2006 年出版64 页ISBN:9781862012844
PRECALCULUS WITH UNIT-CIRCLE TRIGONOMETRY
1990 年出版734 页ISBN:0314710159;0314668136
Mozart and his Circle A Biographical Dictionary
Peter Clive1993 年出版242 页ISBN:046086078X
Literary Circles and Cultural Communities in Renaissance England
2000 年出版243 页ISBN:0826213170
PRECALCULUS WITH UNIT-CIRCLE TRIGONOMETRY THIRD EDITION
DAVID COHEN1998 年出版1040 页ISBN:0534352758