APA (7th ed.) Citation

Maggs Bros. (1920). A catalogue of one hundred Spanish books: : selected from the stock of Maggs Bros booksellers. Maggs Bros.

Chicago Style (17th ed.) Citation

Maggs Bros. A Catalogue of One Hundred Spanish Books: : Selected from the Stock of Maggs Bros Booksellers. London: Maggs Bros, 1920.

MLA (9th ed.) Citation

Maggs Bros. A Catalogue of One Hundred Spanish Books: : Selected from the Stock of Maggs Bros Booksellers. Maggs Bros, 1920.