The German urban plan is implemented by moving the population to New Deido, New Akwa and New Bell and by creating a 1 km Freie Zone to separate those areas from the European city.
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in Frenchedit
René Gouellain (1973). "Douala: formation et développement de la ville pendant la colonisation". Cahiers d'Études africaines (in French). 13 – via Persee.fr.
R. Gouellain (1975). Douala: Ville et Histoire (in French). Paris: Institut d'Ethnologie, Musee de l'Homme.
Lourdes Diaz Olvera; et al. (2010). "Quand tout ne tient qu'à un pont! Réfection d'ouvrage et dysfonctionnements urbains à Douala" [Rehabilitation of a bridge and urban dysfunction in Douala]. Belgeo (in French) (1–2): 183–196. doi:10.4000/belgeo.6763 – via Revues.org.
Adrien Bitond (2012). "Les foyers socioculturels a Douala, 'villages en ville' ou espaces publics de proximite?". In Thomas Atenga, Georges Madib (ed.). La communication au Cameroun (in French). Archives contemporaines. ISBN 9782813000927.
Collectif; Auzias, Dominique; Labourdette, Jean-Paul (2012). "Douala". Cameroun. Le Petit Futé (in French). ISBN 9782746967328.
in Germanedit
Ernst Vollbehr (1912), "Duala", Mit Pinsel und Palette durch Kamerun (in German), Leipzig: List & von Bressensdorf, OCLC 9352214