MLA

Jennekens, E, and G Deen. Boole-algebra's. Kapellen: De Sikkel, 1974.

APA

Jennekens, E., & Deen, G. (1974). Boole-algebra's. Kapellen: De Sikkel.

Chicago

Jennekens, E., and G Deen. Boole-Algebra's. Kapellen: De Sikkel, 1974.