APA
Ketelaar J. A. A., . (1947). De chemische binding. New York: Elsevier Pub. Co.
Chicago
Ketelaar J A A, . 1947. De chemische binding. New York: Elsevier Pub. Co.
Harvard
Ketelaar J. A. A., . (1947). De chemische binding. New York: Elsevier Pub. Co.
MLA
Ketelaar J A A, . De chemische binding. New York: Elsevier Pub. Co. 1947.