On Meditation Instructions from talks by Ajahn Chah

http://www.watpahnanachat.org/books/Aj%20Chah%20On%20Meditation.pdf

Getting Started in Mindfulness with Breathing Accessible Beginning Steps for Ordinary People by Buddhadasa Bhikkhu 

 http://www.bia.or.th/en/index.php/online-dhamma/2013-10-23-08-26-33/send/3-books-texts/8-getting-started-in-mindfulness-with-breathing-accessible-beginning-steps-for-ordinary-people-by-buddhadasa-bhikkhu