APA (7th ed.) Citation

Castle, H. N., Mead, H. C., & Mead, G. H. (2012). The Collected Letters of Henry Northrup Castle. Samuel N. and Mary Castle Foundation.

Chicago Style (17th ed.) Citation

Castle, Henry Northrup, Helen Castle Mead, and George Herbert Mead. The Collected Letters of Henry Northrup Castle. Honolulu, Hawaii: Samuel N. and Mary Castle Foundation, 2012.

MLA (8th ed.) Citation

Castle, Henry Northrup, et al. The Collected Letters of Henry Northrup Castle. Samuel N. and Mary Castle Foundation, 2012.