APA (7th ed.) Citation

(1948). International rules of botanical nomenclature: Formulated by the International Botanical Congresses of Vienna, 1905, Brussels, 1910, and Cambridge, 1930 (2. print., unofficial special ed.). Chronica Botanica.

Chicago Style (17th ed.) Citation

International Rules of Botanical Nomenclature: Formulated by the International Botanical Congresses of Vienna, 1905, Brussels, 1910, and Cambridge, 1930. 2. print., unofficial special ed. Waltham, Mass: Chronica Botanica, 1948.

MLA (9th ed.) Citation

International Rules of Botanical Nomenclature: Formulated by the International Botanical Congresses of Vienna, 1905, Brussels, 1910, and Cambridge, 1930. 2. print., unofficial special ed. Chronica Botanica, 1948.