Articles and e-books
The Buddha was born as a human being. During his life as a human being he realised by his own practice - in the last resort without a teacher - the highest deliverance of suffering (Enlightenment/Nirwana). He never spoke on behalf of (or in service of) another (higher) being. He always referred to the potentials his attendants might realise by their own practice. Step by step, but every step can be a deliverance on its own. At the end of his life the Buddha appointed the Dhamma, his teachings/instructions, as his successor. In this link you will find expositions of the Buddha-Dhamma by contemporary teachers who practice this teaching.
The Mahasi method of Vipassana, as explained by Mahasi Sayadaw in 1951
Additional Instructions from Panditarama International Meditation Centre Lumbini Nepal by Ven. Vivekananda.
This book is a transcription of the Dhamma teachings given by the Burmese meditation teacher Sayadaw U Pandita during his first visit to the USA in 1984, in a three months retreat. First generation American Dhamma-teachers like Goldstein, Kornfield and Salzburg did attend. A warm, powerful and sparkling book, the most important I know.
Guidance for Yogis at Interview. A very basic instruction about the practice by Sayadaw U Pandita. (Dutch translation: 'De weg gebaand').
Vipassana (insight meditation) needs the use of tools or instruments, like ground glass or a sharp knife. Those tools are not given to us from outside, but we have to develop them for ourselves. In that sense this meditation looks like pulling oneself up by one's own hair. However, it is possible to develop the mind, so that it cuts our stubborn opinions like a sharp knife. Such a sharpened mind is no longer dull.
Teaching given by Sayadaw U Pandita (1921 - 2016) during his last Special Retreat on December 28, 2015. Translation into English: Ma Vajira. Transcription and (partly) translation into Dutch: Guus Went.