Lua APA (7ú heag.)
Barrett, W., & Aiken, H. D. Philosophy in the Twentieth Century: An Anthology : Volume Three : [Part Three : Positivism : Moritz Schlick, A.J. Ayer, W.V. Quine]. Random House.
Lua i Stíl Chicago (17ú heag.)
Barrett, William, agus Henry David Aiken. Philosophy in the Twentieth Century: An Anthology : Volume Three : [Part Three : Positivism : Moritz Schlick, A.J. Ayer, W.V. Quine]. Nueva York, EUA: Random House.
Lua MLA (9ú heag.)
Barrett, William, agus Henry David Aiken. Philosophy in the Twentieth Century: An Anthology : Volume Three : [Part Three : Positivism : Moritz Schlick, A.J. Ayer, W.V. Quine]. Random House.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.