Hey all
I do alot of 12 lead basic and advanced instruction and i have seen some gawd aweful books out there. Here are the ones i have liked the best:
Practical Electrocardiography 8th Ed. Marriott.
It is important to get the 8th is you can, that was the last one Marriott actually wrote (he died before the 9th was written) and the subsequent ones are not as good.
12 lead ECG by Dr. T Garcia and N. Holtz - simply awesome. I suggest it at all my advanced classes. Dr Garcia also has a few other ECG books which are excellent.
For understanding there is only one bible.
Hursts The Heart 11th Ed. by Fuster, Alexander and O'Rourke its amazing. Alot of WHYS and Pathophysiology which equates to understanding.