APA (7th ed.) Citation

De Walden, H. (1904). Some feudals lords and their seals. The De Walden Library.

Chicago Style (17th ed.) Citation

De Walden, Howard. Some Feudals Lords and Their Seals. Londres: The De Walden Library, 1904.

MLA (9th ed.) Citation

De Walden, Howard. Some Feudals Lords and Their Seals. The De Walden Library, 1904.