ANKEI Takako, 1988, Discovery of saké in Central Africa: mold-fermented liquor of the Songola », in Journal d'agriculture traditionnelle et de botanique appliquée, Année1986, t. 33, p. 29-47 http://ankei.jp/takako/?n=1673

ANKEI Takako, 1990, Cookbook of the Songola: an Anthropological Study on the Technology of Food Preparation among a Bantu-speaking People of the Zaïre Forest, African Study Monographs. Supplementary Issue 13: 1-174 http://www.africa.kyoto-u.ac.jp/kiroku/asm_suppl/abstracts/pdf/Sup.13/S.13%20Ankei.pdf

ANKEI Yuji, 1984, Fish as "Primitive Money": Barter markets of the Songola, Central Africa. Senri Ethnological Studies, 14: 1-68, National Museum of Ethnology http://jairo.nii.ac.jp/0135/00000165/en

ANKEI Yuji, 1989, Folk Knowledge of Fish among the Songola and the Bwari: Comparative Ethnoichthyology of the Lualaba River and Lake Tanganyika Fishermen, African Study Monographs. Supplementary Issue 9: 1- 88 http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/68349/1/ASM_S_9_1.pdf

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