Luijpen, W. (1962). Existential phenomenology. Duquesne University Press.
Lua i Stíl Chicago (17ú heag.)Luijpen, W. Existential Phenomenology. Pittsburgh: Duquesne University Press, 1962.
Lua MLA (8ú heag.)Luijpen, W. Existential Phenomenology. Duquesne University Press, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.