Hall, A. L., & Molengraaff, G. A. F. (1925). The Vredefort mountain land in the southern Transvaal and the northern Orange Free State. Koninklijke Akademie van Wetenschappen.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHall, A. L., और G. A. F. Molengraaff. The Vredefort Mountain Land in the Southern Transvaal and the Northern Orange Free State. Amsterdam: Koninklijke Akademie van Wetenschappen, 1925.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHall, A. L., और G. A. F. Molengraaff. The Vredefort Mountain Land in the Southern Transvaal and the Northern Orange Free State. Koninklijke Akademie van Wetenschappen, 1925.
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