APA (7th ed.) Citation

Optic, O. Four Young Explorers; Or, Sight-Seeing in the Tropics.

Chicago Style (17th ed.) Citation

Optic, Oliver. Four Young Explorers; Or, Sight-Seeing in the Tropics.

MLA (9th ed.) Citation

Optic, Oliver. Four Young Explorers; Or, Sight-Seeing in the Tropics.

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