Taking Rights Seriously

Further reading:

Arguments for Liberty edited by Aaron Ross Powell & Grant Babcock

Libertarianism by Eric Mack

Classical Liberalism and Libertarianism: The Liberty Tradition by Eric Mack & Gerald F. Gaus

Libertarianism (Stanford Encyclopedia of Philosophy)

Essays and books by Murray N. Rothbard:

Anatomy of the State (Chapter 3 in Egalitarianism as a Revolt Against Nature, and Other Essays)
Justice and Property Rights (Chapter 4 in Egalitarianism as a Revolt Against Nature, and Other Essays)
For a New Liberty: The Libertarian Manifesto
The Ethics of Liberty (an online pdf is available here)

Entries in The Encyclopedia of Libertarianism:

Individual Rights by Eric Mack (p. 244)
Non-Aggression Principle by Roderick T. Long (p. 357)
Natural Law by Fred Miller (p. 351)
Natural Rights by Fred Miller (p. 434)
Theories of Rights by Douglas B. Rasmussen (p. 436)

Eric Mack: Selected articles and book chapters

Books by Douglas B. Rasmussen & Douglas J. Den Uyl:

Liberty for the 21st Century: Contemporary Libertarian Thought edited by Tibor R. Machan & Douglas B. Rasmussen

The Libertarian Nonaggression Principle by Matt Zwolinski

Rescuing the Libertarian Non-Aggression Principle by Billy Christmas

Lecture series:

Foundations of Libertarian Ethics by Roderick Long

The History of Political Philosophy: From Plato to Rothbard by David Gordon

Other approaches to justifying libertarianism:

Further Philosophical Roads to Libertarianism by Eric Mack

More on natural rights:

Persons, Rights, and the Moral Community by Loren E. Lomasky

Individuals and Their Rights by Tibor R. Machan

Liberty and Justice by Ralf M. Bader

Ethical intuitionism:

The Problem of Political Authority: An Examination of the Right to Coerce and the Duty to Obey by Michael Huemer

Contractarianism:

The Libertarian Idea by Jan Narveson

Respecting Persons in Theory and Practice: Essays on Moral and Political Philosophy by Jan Narveson

You and The State by Jan Narveson

Rule utilitarianism:

The Foundations of Morality by Henry Hazlitt

Ethics as Social Science: The Moral Philosophy of Social Cooperation by Leland B. Yeager

Pluralism and Indirect Consequentialism:

Elements of Justice by David Schmidtz

Debating Libertarianism: What Makes Society Just? by Samuel R. Freeman and Jason Brennan

Consequentialism:

The Machinery of Freedom: Guide to a Radical Capitalism by David Friedman

Other:

Dialogical Arguments for Libertarian Rights by Stephan Kinsella