1. Heberden, William, Snr. (1745). As ref. 935 but pp. 14–15
2. Heberden, William, Snr. (1745). As ref. 935 but p. 16
3. Heberden, William, Snr. (1745). As ref. 935 but pp. 16–17
4. Withering, William (1785). As ref. 1053 but p. 186
5. Withering, William (1785). As ref. 1053, but p. 186