Nondeterministic Finite Automata
- Virginia Tech class notes with definitions, examples and exercises.
- http://courses.cs.vt.edu/~cs4114/lectures/6/nfa.pdf

Nondeterministic FSA and Regular Languages
- University of Pennsylvania course notes with definitions, examples, theorems and problems.
- http://babel.ling.upenn.edu/courses/ling106/nondeterm.pdf

Deterministic FSA and Regular Languages
- University of Pennsylvania course notes with definitions, examples, theorems and problems.
- http://babel.ling.upenn.edu/courses/ling106/detfsa.pdf

Deterministic Finite Automata
- Virginia Tech course notes on FSA.
- http://courses.cs.vt.edu/~cs4114/lectures/6/dfa.pdf

Nondeterministic Finite State Machines
- A Wikipedia article on nondeterministic FSA.
- http://en.wikipedia.org/wiki/Nondeterministic_finite_automaton

Finite-State Automata and Regular Languages
- Basic definitions and theorems connecting FSA and regular languages.
- http://www.cse.ohio-state.edu/~gurari/theory-bk/theory-bk-twose3.html

Finite State Automata
- An introduction to deterministic and nondeterministic FSA, with simple examples.
- http://www.eti.pg.gda.pl/katedry/kiw/pracownicy/Jan.Daciuk/personal/thesis/node12.html