Gapers.

MLA

Wittop Koning, D. A. Gapers. Hilversum: s.n., 1958.

APA

Wittop Koning, D. A. (1958). Gapers. Hilversum: s.n.

Chicago

Wittop Koning, D. A. Gapers. Hilversum: s.n., 1958.