Webb, S., & Webb, B. P. (1920). The history of trade unionism (Rev. ed, extended to 1920.). Longmans, Green, and Co.
Chicago Style (17th ed.) CitationWebb, Sidney, and Beatrice Potter Webb. The History of Trade Unionism. Rev. ed, extended to 1920. London [etc.]: Longmans, Green, and Co, 1920.
MLA (9th ed.) CitationWebb, Sidney, and Beatrice Potter Webb. The History of Trade Unionism. Rev. ed, extended to 1920. Longmans, Green, and Co, 1920.
Warning: These citations may not always be 100% accurate.