Παραπομπή APA

Robin, G., & Keith Roberts. (1972). British portrait painters. Encyclopaedia Britannia.

Παραπομπή Chicago Style

Robin, Gibson, και Keith Roberts. British Portrait Painters. London: Encyclopaedia Britannia, 1972.

Παραπομπή MLA

Robin, Gibson, και Keith Roberts. British Portrait Painters. Encyclopaedia Britannia, 1972.