MLA

Kabouter Kolonel. Kabouterkolonel, 1970. https://collections.library.yale.edu/catalog/10079721.

APA, 6th edition

Kabouter kolonel. (1970). [Announcements (AAT), Autographs, illustrations (AAT), periodicals (AAT), Treatises]. Kabouterkolonel, https://collections.library.yale.edu/catalog/10079721.