Holst, B. P. (1928). The Progressive reference library: A new edition with extensive revisions, constituting a consolidation of the publications formerly on the market under the titles: International reference work and The new teachers' and pupils' cyclopaedia; a library of history, geography, biography, biology, literature, economics, civics, arts, sciences, discoveries, explorations, inventions, commerce, etc.; cyclopaedia of general and recent information. Holst Pub.
Chicago Style (17th ed.) CitationHolst, Bernhart Paul. The Progressive Reference Library: A New Edition with Extensive Revisions, Constituting a Consolidation of the Publications Formerly on the Market Under the Titles: International Reference Work and The New Teachers' and Pupils' Cyclopaedia; a Library of History, Geography, Biography, Biology, Literature, Economics, Civics, Arts, Sciences, Discoveries, Explorations, Inventions, Commerce, Etc.; Cyclopaedia of General and Recent Information. Boone, Ia: Holst Pub, 1928.
MLA (9th ed.) CitationHolst, Bernhart Paul. The Progressive Reference Library: A New Edition with Extensive Revisions, Constituting a Consolidation of the Publications Formerly on the Market Under the Titles: International Reference Work and The New Teachers' and Pupils' Cyclopaedia; a Library of History, Geography, Biography, Biology, Literature, Economics, Civics, Arts, Sciences, Discoveries, Explorations, Inventions, Commerce, Etc.; Cyclopaedia of General and Recent Information. Holst Pub, 1928.