Volterra, V. (1959). Theory of functionals and of integrals and integro-differential equations. Dover.
Chicago-viite (17. p.)Volterra, Vito. Theory of Functionals and of Integrals and Integro-differential Equations. New York: Dover, 1959.
MLA-viite (9. p.)Volterra, Vito. Theory of Functionals and of Integrals and Integro-differential Equations. Dover, 1959.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.