Section 57

In any prosecution under this Act, the Court may refer, for the purposes of evidence, to any of the following books—

Thian Ti Hwui, the Hung-League or Heaven-Earth League, by G. Schlegel;

The Triad Society, by W. Stanton;

The Hung Society or the Society of Heaven and Earth, by J. S. M. Ward and W. G. Stirling;

Triad Societies in Hong Kong, by W. P. Morgan, and to any other published books or articles on the subject of unlawful societies in general or of particular unlawful societies, which the Court may consider to be of authority on the subject to which they relate.