This book includes the various subspace-based techniques, search based and many others... Hope this will work for you: 

"Classical and Modern Direction-of-Arrival Estimation" Edited By

T. Engin Tuncer , Benjamin Friedlander

Try this one

Introduction to Direction-of-Arrival Estimation

 By Zhizhang Chen, Gopal Gokeda, Yiqiang Yu

• Maybe, reviews that can help you know the history of DOA are better for you. such as : "two decades of array signal processing research : the parametric approach " , which you can search in Ieee explore or Google.
• MUSIC and ESPRIT are two most important subspace algorithms 

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=526899&refinements%3D4291944246%26queryText%3Dtwo+decades+of+array+signal+processing

Engineering Applications of Correlation and Spectral Analysis,

Julius S. Bendat and Allan G. Piersol

Dear Mohanad,

                       I will suggest you these two books:

1. Introduction to Direction-Of-Arrival Estimation (Artech House Signal Processing Library)

2. Classical and Modern Direction-of-Arrival Estimation

Regards,

A.Kar

Optimum Array Processing book

Optimum Array Processing by Harry L. Van Trees

"Introduction to Direction-of-Arrival Estimation" By Zhizhang Chen, Gopal Gokeda, Yiqiang Yu

is the best.