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The Works and Correspondence of David Ricardo. Volume I: On the Principles of Political Economy and Taxation. Volume II: Notes on Malthus' Principles of Political Economy. Volume III: Pamphlets and Papers.(1809—1811). Volume IV: Pamphlets and Papers (1815—1823), Volume V: Speeches and Evidence
The Value of Science. By H. Poincaré, Member of the Institute of France. Authorized Translation with an Introduction, by George Bruce Halsted, Ph. D., FRAS With a Special Prefatory Essay. Pp. iv+ 147. New York, The Science Press. 1907.
Letters in the collection of the Austrian National Library as a source for the history of the University of Tartu [Kokkuvõte: Tartu ülikooliga seotud erakirjad Austria Rahvusraamatukogus]