Citazione Stile APA (7a Edizione)

Zimmermann, A., & Zimmermann, S. (2023). Social studies (2023, first published 2023.). NPH, Namibia Publishing House.

Citazione stile Chigago Style (17a edizione)

Zimmermann, A., e S. Zimmermann. Social Studies. 2023, first published 2023. Winkhoek, Namibia: NPH, Namibia Publishing House, 2023.

Citatione MLA (9a ed.)

Zimmermann, A., e S. Zimmermann. Social Studies. 2023, first published 2023. NPH, Namibia Publishing House, 2023.