APA (7e ed.) Bronvermelding

Engelmann, P., Furtmuller, L., McGuinness, B. F., & Wittgenstein, L. (1968). Letters from Ludwig Wittgenstein: With a memoir. Horizon Press.

Chicago (17e ed.) Bronvermelding

Engelmann, Paul, L. Furtmuller, B. F. McGuinness, en Ludwig Wittgenstein. Letters from Ludwig Wittgenstein: With a Memoir. New York: Horizon Press, 1968.

MLA (9e ed.) Bronvermelding

Engelmann, Paul, et al. Letters from Ludwig Wittgenstein: With a Memoir. Horizon Press, 1968.