Introduction to Tensor Calculus ,Relativity and Cosmology 
Lawden , D.F. 
 - 3rd ed. 
 - Mineola :  Dover Publication, Inc,  2002 
 - xiii , 205 p , :  24 cm 
<br/><br/><label>ISBN: </label>0486425401 
<br/><br/><label>LC Class. No.: </label>QC173.55  / .L38  2002