Zweig, S., & Gregor, J. (~ 1991). Correspondence : 1921 - 1938 [Book]. בתוך K. Birkin (בעריכת), Otago German studies. Univ. of Otago, Dep. of German.
Chicago Manual of Style 17th edition (author-date)Zweig, Stefan, ו Joseph Gregor. 1991. Correspondence : 1921 - 1938. Book. נערך ע"י Kenneth Birkin. Otago German studies. Otago German studies 6. Dunedin: Univ. of Otago, Dep. of German.
Springer - Basic (author-date)Zweig S, Gregor J (1991) Correspondence : 1921 - 1938. Univ. of Otago, Dep. of German, Dunedin
Springer - Lecture Notes in Computer Science1.Zweig, S., Gregor, J.: Correspondence : 1921 - 1938. Univ. of Otago, Dep. of German, Dunedin (1991).
DIN 1505-2 (author-date, Deutsch) - standard superseded by ISO-690Zweig, Stefan ; Gregor, Joseph ; Birkin, K. (בעריכת) ; ; : Correspondence : 1921 - 1938, Otago German studies. book. Dunedin : Univ. of Otago, Dep. of German, 1991 — ISBN 0959765050