In memoriam Franz De Backer.

MLA

De Keyser, Paul. In Memoriam Franz De Backer. Brussel: s.n., 1961.

APA

De Keyser, P. (1961). In memoriam Franz De Backer. Brussel: s.n.

Chicago

De Keyser, Paul, In Memoriam Franz De Backer. Brussel: s.n., 1961.