Smith-Rose, Reginald Leslie. Alexandr Popov. Encyclopaedia Britannica Online. Encyclopedia Britannica, Inc. 2013 [6 November 2013]. (原始内容存档于2015-05-18).
Smith-Rose, Reginald Leslie. Alexandr Popov. Encyclopaedia Britannica Online. Encyclopedia Britannica, Inc. 2013 [6 November 2013]. (原始内容存档于2015-05-18).