三角学 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "三角学" in Chinese language version.

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books.google.com

Otto Neugebauer. A history of ancient mathematical astronomy. 1. Springer-Verlag. 1975: 744– [2013-03-23]. ISBN 978-3-540-06995-9. （原始内容存档于2013-10-09）.

Otto Neugebauer. A history of ancient mathematical astronomy. 1. Springer-Verlag. 1975: 744– [2013-03-23]. ISBN 978-3-540-06995-9. （原始内容存档于2013-10-09）.
"The Beginnings of Trigonometry （页面存档备份，存于互联网档案馆）". Rutgers, The State University of New Jersey.
數學. 北京: 清华大学出版社有限公司. 2006 [2013-08-21]. ISBN 7810826751. （原始内容存档于2014-08-19）.