Heilbron, J. L..
The sun in the church: cathedrals as solar observatories /
J.L. Heilbron 
. - Cambridge : London : Harvard University Press,  1999 
. - ix, 366 p.  ill.  26 cm. 
<br/>К.: Бібліогр. : c. 305-328, Index 
<br/><label>  ISBN: </label>0-674-85433-0 0-674-00536-8