Here you can find some basics for understanding conceptual art.
Well, about book about conceptual my recommendations are:
Conceptual Art A&I (Art and Ideas)

Conceptual Art (Themes and Movements)

Conceptual Art: A Critical Anthology

A 1960s innovation prioritizing idea over execution. At its extreme, a conceptual art work may consist only of a brief written description or set of instructions for fabrication. However, in practice, conceptual art intermingled freely with other 1960s and 1970s tendencies, such as minimalism, earth art, and performance art, as well as politically oriented art. It has also affected the underlying ethos of later art.

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