This introduction to Patanjali's Yoga Sutras by Swami Vivekananda is an excellent overview of the subject of meditation and is highly recommended to every sincere practitioner. It scientifically and lucidly explains the various steps of Yoga.
The "Gospel of Sri Ramakrishna" is chronicle of the sublime, catholic and universal teachings of Sri Ramakrishna, the Incarnation of this age. Mahendranath Gupta (M.) has recorded his utterances with stenographic precision. The Gospel is a beacon light to all who tread the spiritual path, to whichever race or religion they may belong. It has been translated from the original Bengali to English by Swami Nikhilananda. The Gospel is available from any of the branch centres of the Ramakrishna Order or it may be ordered online from Ramakrishna Math, Chennai, India:-
http://www.sriramakrishnamath.org