Max Sterling

Problems in mystery: for practical magicians

1909.

Abbott Handerson Thayer

An arraignment of the theories of mimicry and warning colors

Popular Science Monthly, Vol. 75, The Science Press, New York dicembre 1909, pp. 550-570.

Gerald Handerson Thayer

Concealing-coloration in the animal kingdom. An exposition of the laws of disguise through color and pattern: being a summary of Abbott H. Thayer's discoveries

The Macmillan Co., New York 1909.

Alessandro Verri

Lettera di Alessandro Verri a Gian Rinaldo Carli

Pagine Istriane. Periodico mensile scientifico, letterario, artistico, N. 4-5, Capodistria aprile 1909, p. 108.