Catalogue of Works by Dame Laura and Harold Knight ( auction London, Sotheby & Co., 18.07.1973).

MLA

Catalogue of Works by Dame Laura and Harold Knight ( Auction London, Sotheby & Co., 18.07.1973). London: Sotheby, 1973.

APA

(1973). Catalogue of Works by Dame Laura and Harold Knight ( auction London, Sotheby & Co., 18.07.1973). London: Sotheby.

Chicago

Catalogue of Works by Dame Laura and Harold Knight ( Auction London, Sotheby & Co., 18.07.1973). London: Sotheby, 1973.