Graphic Design

Type and Image: The Language of Graphic Design
by Philip Meggs
Publisher: Wiley (March 1992)
ISBN: 0471284920
A good place to start. Comprehensive text with good examples and illustrations.

Grid Systems in Graphic Design
by Josef Muller-Brockmann,
Publisher: Arthur Niggli; Bilingual edition (1996)
ISBN: 3721201450
An excellent introduction to the purpose and use of grid systems.

D.I.Y.: Design It Yourself
by Ellen Lupton
Publisher: Princeton Architectural Press; 1 edition (January 1, 2006)
ISBN: 1568985525
Do-it-yourself graphic design book