Requesting a book recommendation (Spanish Reales)

I usually read/post on the US coin forums but have taken an interest in Spanish Reales. I was hoping someone with experience in these types of coins could point me towards a quality guide to grading and any other good references books. I purchased the coin below at a local show Friday...not high grade, but I sure do like it!
Thanks!
Thanks!

Finest Coins and Relics
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Comments
Gary
DPOTD
BTW your 2nd photo is upside-down
-Mike
I'm diving in Cuba for 2 weeks - internet is pretty bad, so not sure if this will even get posted. I'll write more once I'm home around the 17th of May.
Welcome to the very addicting area of collecting
8 Reales Madness Collection
These two books are expensive, and probably not a good investment for a beginner. Better to simply pick up the Krause catalogs to figure out what exists and what you would want to collect.
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.