Article Tjaden, W.L. (1994)
The medals of the Royal Horticultural Society. Archives of Natural History (pp. 77-112). (/isis/citation/CBB000029755/) unapi

Article Tjaden, W.L. (1993)
The Lindley Library of the Royal Horticultural Society, 1866-1926. Archives of Natural History (pp. 93-128). (/isis/citation/CBB000037972/) unapi

Article Tjaden, W. L. (1982)
Miller's Gardener's dictionary: Some inconsistencies between editions. Archives of Natural History (pp. 153-158). (/isis/citation/CBB000003582/) unapi

Book Wheeler, Alwyne; Price, James H. (1981)
History in the service of systematics: Papers from the Conference to celebrate the centenary of the British Museum (Natural History), 13-16 April, 1981. (/isis/citation/CBB000020779/) unapi

Article Tjaden, W. L. (1979)
Amaryllis belladonna and the Guernsey lily: An overlooked clue. Journal of the Society for the Bibliography of Natural History (pp. 251-256). (/isis/citation/CBB000005300/) unapi

Article Tjaden, W.L. (1977)
William and James Sherard and John James Dillenius: Some errors in the biographies. Journal of the Society for the Bibliography of Natural History (pp. 143-147). (/isis/citation/CBB000027988/) unapi

Article Tjaden, W.L. (1976)
Sebastien Vaillant's flora of Paris, Botanicon parisiense, 1727. Journal of the Society for the Bibliography of Natural History (pp. 11-27). (/isis/citation/CBB000028317/) unapi

Article Tjaden, W.L. (1976)
John Woodward, Hans Sloane, and Johann Gaspar Scheuchzer: Somer further information. Journal of the Society for the Bibliography of Natural History (pp. 74-77). (/isis/citation/CBB000027986/) unapi