Pa Auk Sayadaw and his work "Knowing and Seeing". A text that details samatha (deep access concentration and the jhanas) as well as a variety of vipassana techniques. Considered the prized text of the Pa Auk Forest Monastery in southern Burma.
You may find this book helpful:Wisdom Wide and Deep: A Practical Handbook for Mastering Jhana and Vipassana
By Shaila Catherinehttp://imsb.org/books/wwd.php
It is essentially a commentary on Pa Auk Sayadaws commentary.
The heart of the path is SO simple. No need for long explanations. Give up clinging to love and hate, just rest with things as they are. That is all I do in my own practice. Do not try to become anything. Do not make yourself into anything. Do not be a meditator. Do not become enlightened. When you sit, let it be. When you walk, let it be. Grasp at nothing. Resist nothing. Of course, there are dozens of meditation techniques to develop samadhi and many kinds of vipassana. But it all comes back to this - just let it all be. Step over here where it is cool, out of the battle. - Ajahn Chah