*''The Art of SEO: Mastering Search Engine Optimization (Theory in Practice)'' by Eric Enge, Stephan Spencer, Rand Fishkin, Jessie C. Stricchiola and John Battelle. O'Reilly Media; 1st edition (October 28, 2009) | *''The Art of SEO: Mastering Search Engine Optimization (Theory in Practice)'' by Eric Enge, Stephan Spencer, Rand Fishkin, Jessie C. Stricchiola and John Battelle. O'Reilly Media; 1st edition (October 28, 2009) |