The local Indexes of Special Collections Division, Edinburgh University Library, George Square, show references to Steven related material (check the Indexes for more details): proofs of The history of the Scottish church in Rotterdam, published 1833, with the author's own corrections, at La.II.458; letter of Steven to D. Laing, 1838, at La.II.150; mention of Steven in a letter to D. Laing, 1858, at La.IV.18; mention of Steven in a letter of I. L. C. Jacob, in French, addressed from Rotterdam, to D. Laing, 1838, at La.IV.18; and, Steven mentioned in letters of Baron van Weitreenen van Tiellandt, to D. Laing, as the Director of Heriots Hospital, at La.IV.18.

See also the collection GD45/coll-771: 'Letters of Rev. Dr. William Steven, 1836-1837').