Read the whole book – The Synthesis of Yoga
by Michael Colantoni
The Synthesis of Yoga
click and save
http://www.sriaurobindoashram.org/ashram/sriauro/downloadpdf.php?id=37
while you’re at it, this is also recommended;
The Life Divine
click and save
http://www.sriaurobindoashram.org/ashram/sriauro/downloadpdf.php?id=36
and if that is not enough, go here for everything he produced;
The Writings of Sri Aurobindo
http://www.sriaurobindoashram.org/ashram/sriauro/writings.php