Book: Webster, Donald Blake. 1971 Decorated Stoneware Pottery of North America.
• Fragments and pitcher by same maker, signed: p. 36, pl. 17, four fragments (one signed) from Warne and Letts Pottery site, c. 1800-1813; p. 161, no. 206, jug dated 1807Article: Frelinghuysen, Alice Cooney. 09//1989 American Stoneware in the collection of Arthur and Esther Goldberg. Antiques. 568-581.
• Jar by same makers: pls. III, IIIa, impressed "LIBERTY FOR EV (sic)" and "S.AMBOY.N.JERSEY"Book: Branin, M. Lelyn. 1988 The Early Makers of Handcrafted Earthenware and Stoneware in Central and Southern New Jersey.
• Essay on Warne and Letts: pp. 70-75Thesis: Davis, Kathryn Jo. 1986 Warne and Letts Stoneware: A Case Study in Ceramic Interpretation. M.A. University of Delaware Winterthur Program in Early American Culture
• Essay on Warne and Letts: pp. 70-75.Thesis: Racine, Laurel Ann. 1997 Re-examination after Excavation:The Problems of Attributing Wares to Three New Jersey Stoneware Potteries. M.A. University of Delaware Winterthur Program in Early American Culture
• Discusses fragment with similar pattern found at the Warne and Letts site.Catalogue: Crocker Farm, Inc. Crocker Farm Auction Catalogue.
• Listing for marked Warne and Letts jug dated 1807: March 5, 2011 sale, lot 274.Catalogue: Pook & Pook Inc., Downingtown PA (sales cat.).
• Warne and Letts's jar: Greivo sale, May 5, 2012. lot 256.