APA (7th ed.) Citation

National Gallery (Great Britain) & Levey, M. (1959). The German school. Publications Dept., National Gallery.

Chicago Style (17th ed.) Citation

National Gallery (Great Britain) and Michael Levey. The German School. London: Publications Dept., National Gallery, 1959.

MLA (8th ed.) Citation

National Gallery (Great Britain) and Michael Levey. The German School. Publications Dept., National Gallery, 1959.