P. K. Hari 
Excel for the Small Business Owner [PDF ebook] 

Presenting innovative Microsoft Excel techniques for top management professionals, this reference for company leaders who do not have the time to attend courses or read bulky books on the program provides basics, special shortcuts, and tips that cover the special features of Excel. Useful facts, trivia, and insider secrets about Excel are interspersed throughout the text, and readers have the choice of jumping directly to the section of real-life case studies to learn by the innovative Do & Learn (D&L) approach. This reference is fully updated to reflect Excel 12.