Heads of the River Gods from the Custom House are identified in Healy, Elizabeth (1998). The Wolfhound Guide to The River Gods. Dublin: Wolfhound Press. ISBN0-86327-642-3. Healy's identifications are taken from Leask, Harold G. (1945), "Dublin Custom House: The Riverine Sculptures", The Journal of the Royal Society of Antiquaries of Ireland, 75 (4): 187–194, JSTOR25510525.