Nwana, M. T., Amawa, S. G., & Ban, B. (2014). Elements of physical geography for junior secondary school (New edition, new syllabus for form 1.). NAB Ventures.
Citazione stile Chigago Style (17a edizione)Nwana, Martin T., Sani G. Amawa, e Blaise Ban. Elements of Physical Geography for Junior Secondary School. New edition, new syllabus for form 1. Bamenda: NAB Ventures, 2014.
Citatione MLA (9a ed.)Nwana, Martin T., et al. Elements of Physical Geography for Junior Secondary School. New edition, new syllabus for form 1. NAB Ventures, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.