'Charles Ricketts en zijn leerling Robert Shannon' (p. 114).
At the time, Madsen's study about art nouveau was no longer the only book on the subject of art nouveau, and both Stephen Calloway and Joseph Darracott had published a book about Ricketts that could have been consulted by Vervliet, who, also, neglected to read John Russell Taylor's 1966 more general study on The art nouveau book in Britain, which by 1982 had reached an almost iconic status as a work of pioneering research and had recently been reprinted.
|Dust wrapper for John Russell Taylor, The art nouveau book in Britain (reprint, 1980)|
And what about Madsen himself? Was he the source of 'pupil' and 'Robert Shannon', or was he also quoting a not completely trustworthy publication?