Thomson, Duncan, "Painting in Scotland, 1570-1650", (1975), 22, citing NRS treasurer's accounts E21/62 fol.19, with voucher E23/5/6: "Archaeologica Scotica", vol.3, (1831), 313.
Thomson, Duncan, "Painting in Scotland", Scottish National Portrait Gallery (1975), 22. NAS treasurer's accounts E21/62 fo.19 voucher E23/5/6: "Archaeologica Scotica", vol.3, (1831), 313.