If you're looking for a PDF link to Sternberg's work, I recommend searching for his publications on academic databases such as Google Scholar or ResearchGate. Some popular papers by Sternberg include:
Unfortunately, I couldn't find a direct link to a PDF version of the book. However, you can try searching for the book on online libraries or academic databases, such as: psicologia cognitiva sternbergpdf link
: A full PDF version of the 6th edition available through the Ferdowsi University of Mashhad . If you're looking for a PDF link to