I came accross a chapter of some book about "quadrilaterals" and I would like to know what book / document it originates from.
Here is the link to the said chapter link
Thanks in advance.
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The book should be
AN INTRODUCTION TO QUADRILATERAL GEOMETRY
By Ovidiu T. Pop, Nicu¸sor Minculete, and Mih´aly Bencze Editura Didactica Si Pedagogica, R. A., Bucuresti, 2013. 300 pp. ISBN 978-973-30-3324-0.
One possibility to find out something like this is to take a chapter title / some sentence, that doesn't sound too general and just google it, often you will find it out then.