Linda Raschke has been a professional trader for over 23 years, and has a brand new eBook available for free download.
I have found her trading concepts fairly clear and understandable.
I haven't read it all yet, but seems worth a look. It is a compilation of trading articles she has written over the years - from tape reading (Wyckoff style) to Mental Principles.
Probably worth a look, especially for newer players of the game.
Just enter a name and email address to get a link - I have found her quite trustable and will not spam you or sell your info-