APA

Spears P., . (2007). A tour of the flowering plants, based on the classification system of the angiosperm phylogeny group / P. Spears. St. Louis, Missouri: Missouri Botanical Garden Press.

Chicago

Spears Priscilla, . 2007. A tour of the flowering plants, based on the classification system of the angiosperm phylogeny group / P. Spears. St. Louis, Missouri: Missouri Botanical Garden Press.

Harvard

Spears P., . (2007). A tour of the flowering plants, based on the classification system of the angiosperm phylogeny group / P. Spears. St. Louis, Missouri: Missouri Botanical Garden Press.

MLA

Spears Priscilla, . A tour of the flowering plants, based on the classification system of the angiosperm phylogeny group / P. Spears. St. Louis, Missouri: Missouri Botanical Garden Press. 2007.