For your general delectation and future reference, here is a brief list of some of the basic sources for Italian Renaissance art and architecture. Even the general literature is vast in number and subject, so use the titles below as the beginnings of more extensive browsing. Please remember that there is also a Bibliography page attached to almost every one of the online Lives of Giorgio Vasari.
A thematic approach to the art of the Italian Renaissance.
On the Renaissance in Northern and Southern Europe.
These three are part of a series of short paperbacks describing the art of the period in Southern and Northern Europe.
Space and perspective systems before Alberti.
These are the two essential books on the art of the fresco; the first is a descriptive catalogue of frescoes in Tuscany, and the second is the catalogue of the landmark exhibition devoted to the frescoes restored after the damage caused by the 1966 flood.
Heinrich Wolfflin. Classic Art: an Introduction to the Italian Renaissance. London, 1952.
Use the third edition of 1985, for it has a section on "recent" scholarly work. While this is somewhat behind the times, it has the advantage of including the considerations on subsequent studies by the man considered to have been perhaps the most influential of Italian Renaissance scholars of the second half of this century.
While much of this is outdated, it still includes useful material, including some artists Pope-Hennessy doesn't discuss and relevant bibliography.
A good handbook for Florence; moving from the Pisani to Mannerism and the Late Renaissance.
Not as useful as they could have been--for bizarre legal reasons the texts could only be updated with a short preliminary chapter, rather than truly revised. However, the new large format with the excellent illustrations is some compensation.
These three are all from the same "Perspectives" series.
An introduction to ideas about urban design in the Italian Renaissance.
(Above Left) Detail, Luca della Robbia, the Cantoria, 1431-1438.