|Title : An Analysis of Various Versions of A.M. Toplady's Rock of Ages, Cleft For Me (1774-2001)|
|Author : Samuel J. Rogal|
This book is exactly what it claims to be, an exhaustive study of how (and why) the text of "Rock of Ages" has changed over the years. there is also a useful biography of Toplady.
If you are discussing the form of "Rock of Ages" you prefer you really need this good (but eye wateringly expensive) book.