APA (7th ed.) Citation

Henry, O., & Twain, M. The jumping frog. The last leaf.

Chicago Style (17th ed.) Citation

Henry, O., and Mark Twain. The Jumping Frog. The Last Leaf.

MLA (8th ed.) Citation

Henry, O., and Mark Twain. The Jumping Frog. The Last Leaf.

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