The Kama Sutra of Vatsyayana
by Vatsyayana

The Art of War
by Sunzi 6th cent. B.C.

The Prince
by Niccolò Machiavelli

How to Analyze People on Sight / Through the Science of Human Analysis: The Five Human Types
by Elsie Lincoln Benedict

FocusFree
by Leo Babauta

The Art of Public Speaking
by Dale Carnegie

Above Life's Turmoil
by James Allen

Giving presentations - OpenLearn - The Open University
by The Open University

Essay and report writing skills - OpenLearn - The Open University
by The Open University

Explore your blind spot
by Tom Stafford