Books on Left-libertarianism, Right-libertarianism
Left-libertarianism endorses full self-ownership, but differs on unappropriated natural resources. Right-libertarianism holds that unappropriated natural resources may be appropriated by individuals.
Left-libertarianism holds that unappropriated natural resources belong to everyone and must be distributed in some egalitarian manner.
Leonard Read rejected the concepts of left and right libertarianism, calling them "Authoritarianism."
Libertarianism is a term used by political philosophies which seek to promote individual liberty and seek to minimize or abolish the state.
Libertarian socialism is often used as a synonym for non-individualist anarchism or socialist anarchism, to dilineate it from individualist libertarianism.
People who do not use libertarianism as a synonym for anarchism but use it to refer to individualistic free-market economy philosophy only, refer to free-market anarchism as libertarian anarchism. Libertarianism is also synonymous with classical liberalism.
The word libertarian is an antonym of authoritarian. Till recently the term libertarianism was often used as a synonym for Anarchism.