Coba jelasin Kutipan dari Peter Carl Ludwig Schwarz dong

Great Britain, India Office (1878), A Catalogue of Manuscript and Printed Reports, Field Books, Memoirs, Maps, etc., of the Indian Surveys, Deposited in the Map Room of the India Office. See Amur map catalogue entry appearing in the Asiatic Russia section, p. 511.

Mollin, Richard A. (2011), Algebraic Number Theory, Second Edition, CRC Press,  (ebook).

SCTLRAS (1900), Supplementary Catalogue of The Library of the Royal Astronomical Society, June 1884 – 1898, Royal Astronomical Society, Burlington House, London; Spottiswoode & Co., London (publisher).

. This reference uses "(1822-1894)" at p. 119.