Erni, H., & Burckhardt, C. J. (1970). Hans Erni: Carl J. Burckhardt. Rencontre.
Cita Chicago (17th ed.)Erni, Hans, i Carl Jacob Burckhardt. Hans Erni: Carl J. Burckhardt. Genf: Rencontre, 1970.
Cita MLA (8th ed.)Erni, Hans, i Carl Jacob Burckhardt. Hans Erni: Carl J. Burckhardt. Rencontre, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.