Oman, Charles C., and Hamilton, Jean. Wallpapers: a history and illustrated catalogue of the collection of the Victoria and Albert Museum. London: Sotheby Publications, in association with the Victoria and Albert Museum, 1982.
The full text of the entry is as follows:
Nine sheets with designs based on textiles in the Victoria & Albert Museum
Colour machine prints
E.40-42 bear the Patent Office registration marks for the year 1919.'
Entwisle, E. A. Wallpapers of the Victorian Era. Leigh-on-Sea, 1964.
Plate 24, fig 42.