Rescher, N. (1969). Introduction to value theory. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Rescher, Nicholas. Introduction to Value Theory. Englewood Cliffs, N.J: Prentice-Hall, 1969.
Lua MLA (9ú heag.)Rescher, Nicholas. Introduction to Value Theory. Prentice-Hall, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.