Não informado. (1942). Monthly Notes of the Astronomical Society of South Africa. Astronomical Society of Southern Africa.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Monthly Notes of the Astronomical Society of South Africa. Cape Town, Africa do Sul: Astronomical Society of Southern Africa, 1942.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Monthly Notes of the Astronomical Society of South Africa. Astronomical Society of Southern Africa, 1942.
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