Opsomer.

MLA

Bernard, Charles, and Isidoor Opsomer. Opsomer. Anvers: De Sikkel, 1947.

APA

Bernard, C., & Opsomer, I. (1947). Opsomer. Anvers: De Sikkel.

Chicago

Bernard, Charles, and Isidoor Opsomer. Opsomer. Anvers: De Sikkel, 1947.