APA (7th ed.) Citation

Gordon, H. The River Motor Boat Boys on the Amazon; Or, The Secret of Cloud Island.

Chicago Style (17th ed.) Citation

Gordon, Harry. The River Motor Boat Boys on the Amazon; Or, The Secret of Cloud Island.

MLA (9th ed.) Citation

Gordon, Harry. The River Motor Boat Boys on the Amazon; Or, The Secret of Cloud Island.

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