MLA

Wittgenstein, Ludwig, et al. Wittgenstein: Gesamtbriefwechsel / Complete Correspondence. Innsbrucker Electronic Edition. (2nd Release). Electronic edition. Charlottesville, Va.: InteLex Corporation, 1993.

APA

Wittgenstein, L., Seekircher, M., Unterkircher, A., & McGuinness, B. (1993). Wittgenstein: Gesamtbriefwechsel / Complete Correspondence. Innsbrucker Electronic Edition. (2nd Release). Electronic edition. Charlottesville, Va.: InteLex Corporation.

Chicago

Wittgenstein, Ludwig, Monika Seekircher, Anton Unterkircher, and Brian McGuinness. Wittgenstein: Gesamtbriefwechsel / Complete Correspondence. Innsbrucker Electronic Edition. (2nd Release). Electronic edition. Charlottesville, Va.: InteLex Corporation, 1993.