APA (7th ed.) Citation

Romer, I. F., Bentley, R., & Bentley, R. (1843). The Rhone, the Darro, and the Guadalquivir: A summer ramble in 1842. R. Bentley.

Chicago Style (17th ed.) Citation

Romer, Isbella Frances, Richard Bentley, and Richard Bentley. The Rhone, the Darro, and the Guadalquivir: A Summer Ramble in 1842. London: R. Bentley, 1843.

MLA (9th ed.) Citation

Romer, Isbella Frances, et al. The Rhone, the Darro, and the Guadalquivir: A Summer Ramble in 1842. R. Bentley, 1843.