1. Inleiding in de wijsbegeerte Author/Creator: Popma, Klaas Johan, 1903- Publication/Creation: Kampen : J. H. Kok, 1956 Resource Type: Book Access & Availability: Loading
2. Achtergrond der wijsbegeerte Author/Creator: Popma, Klaas Johan, 1903- Publication/Creation: Kampen : J.H. Kok, 1948 Resource Type: Book Access & Availability: Loading
3. Calvinistische geschiedenis-beschouwing Author/Creator: Popma, Klaas Johan, 1903- Publication/Creation: Franeker : T. Wever, 1945 Resource Type: Book Access & Availability: Loading