Gortz, F. J. Heinrich boll, on his death selected obituaries and the last interview. Intet nationes bonn.
Chicago-viite (17. p.)Gortz, Franz Josef. Heinrich Boll, on His Death Selected Obituaries and the Last Interview. Intet nationes bonn.
MLA-viite (8. p.)Gortz, Franz Josef. Heinrich Boll, on His Death Selected Obituaries and the Last Interview. Intet nationes bonn.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.