J. K., Macgregor. Some Notes on Nsibidi.. Journal of the Royal Anthropological Institute (Royal Anthropological Institute of Great Britain and Ireland). January–June 1909, 39: 209–219 [2023-08-18]. JSTOR 2843292. doi:10.2307/2843292. (原始内容存档于2023-08-18).
J. K., Macgregor. Some Notes on Nsibidi.. Journal of the Royal Anthropological Institute (Royal Anthropological Institute of Great Britain and Ireland). January–June 1909, 39: 209–219 [2023-08-18]. JSTOR 2843292. doi:10.2307/2843292. (原始内容存档于2023-08-18).
J. K., Macgregor. Some Notes on Nsibidi.. Journal of the Royal Anthropological Institute (Royal Anthropological Institute of Great Britain and Ireland). January–June 1909, 39: 209–219 [2023-08-18]. JSTOR 2843292. doi:10.2307/2843292. (原始内容存档于2023-08-18).
J. K., Macgregor. Some Notes on Nsibidi.. Journal of the Royal Anthropological Institute (Royal Anthropological Institute of Great Britain and Ireland). January–June 1909, 39: 209–219 [2023-08-18]. JSTOR 2843292. doi:10.2307/2843292. (原始内容存档于2023-08-18).