Abraham H. Maslow 
A Theory of Human Motivation [EPUB ebook] 

Maslow’s hierarchy of needs is a theory in psychology proposed by Abraham Maslow in his 1943 paper 'A Theory of Human Motivation’ in Psychological Review. Maslow subsequently extended the idea to include his observations of humans’ innate curiosity. His theories parallel many other theories of human developmental psychology, some of which focus on describing the stages of growth in humans. Maslow used the terms Physiological, Safety, Belongingness and Love, Esteem, Self-Actualization and Self-Transcendence needs to describe the pattern that human motivations generally move through.