It is very important to always record the citation for each of the sources one is using.  The same holds true for a deed that was found in the County Recorder’s Office.

for blog spine of book

Sometimes the information on the spine can be lengthy – title of the book, “letter” of the book, dates covered, etc.  Instead of writing down the information, take a photograph of the spine.  Of course, it is important to first ask someone in the office whether or not this is permissible.  I have been in some offices where one can photograph the actual documents, and some offices where it is only permissible to photograph the spine.