APA (7th ed.) Citation

Horn, W. W., Marshall, J. W., & Rourke, G. D. (1990). The forgotten hermitage of Skellig Michael. University of California Press.

Chicago Style (17th ed.) Citation

Horn, Walter William, Jenny White Marshall, and Grellan D. Rourke. The Forgotten Hermitage of Skellig Michael. Berkeley: University of California Press, 1990.

MLA (9th ed.) Citation

Horn, Walter William, et al. The Forgotten Hermitage of Skellig Michael. University of California Press, 1990.