Johnson, J. (1950). Basic contributing factors to Vai culture and and some general customs of the tribe. s.n..
Čikaški stil citiranja (17. izdanje)Johnson, Jangaba. Basic Contributing Factors to Vai Culture and and Some General Customs of the Tribe. [Monrovia, Liberia?: s.n., 1950.
MLA način citiranja (8. izdanje)Johnson, Jangaba. Basic Contributing Factors to Vai Culture and and Some General Customs of the Tribe. s.n., 1950.
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