Professional WordPress Plugin Development, 2nd Edition

Professional WordPress Plugin Development by John James Jacoby, Brad Williams...

Professional Wordpress Plugin Development

Professional WordPress Plugin Development, 2nd Edition, Williams, Brad,Tadlock,

Professional WordPress Plugin - Paperback, by Williams Brad; Tadlock - Very Good

Professional WordPress Plugin Development, 2nd Edition by Williams, Brad

Professional WordPress Plugin Development, 2nd Edition, James Jacoby, John,Willi

WordPress Plugin Development C - VERY GOOD