APA Citation

Thompson, F. G., & Thompson, F. G. Four species of land snails from Costa Rica and Panama (Pulmonata: Spiraxidae).

Chicago Style Citation

Thompson, Fred G., and Fred G. Thompson. Four Species of Land Snails From Costa Rica and Panama (Pulmonata: Spiraxidae).

MLA Citation

Thompson, Fred G., and Fred G. Thompson. Four Species of Land Snails From Costa Rica and Panama (Pulmonata: Spiraxidae).

Warning: These citations may not always be 100% accurate.