Não informado. (1942). Monthly Notes of the Astronomical Society of South Africa. Astronomical Society of Southern Africa.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Monthly Notes of the Astronomical Society of South Africa. Cape Town, Africa do Sul: Astronomical Society of Southern Africa, 1942.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Monthly Notes of the Astronomical Society of South Africa. Astronomical Society of Southern Africa, 1942.
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