Sid Perkins. Step-hyphen;'s By-hyphen;'s Step Evolution: Mining the Gaps: Transitional fossils are the hardest to find, but sometimes tell the best stories. „Science News”. 175 (3), s. 30–33, 2009. DOI: 10.1002/scin.2009.5591750320. ISSN0036-8423. (ang.).
Louise S. Mead. Transforming Our Thinking about Transitional Forms. „Evolution: Education and Outreach”. 2 (2), s. 310–314, 2009. DOI: 10.1007/s12052-009-0126-3. ISSN1936-6426. (ang.).
Emanuele Rigato, Alessandro Minelli. The great chain of being is still here. „Evolution: Education and Outreach”. 6 (1), s. 18, 2013. DOI: 10.1186/1936-6434-6-18. ISSN1936-6434. (ang.).
Edward B. Daeschler, Neil H. Shubin, Farish A. Jenkins. A Devonian tetrapod-like fish and the evolution of the tetrapod body plan. „Nature”. 440 (7085), s. 757–763, 2006. DOI: 10.1038/nature04639. ISSN0028-0836. (ang.).
Jennifer A. Clack. The Fish–Tetrapod Transition: New Fossils and Interpretations. „Evolution: Education and Outreach”. 2 (2), s. 213–223, 2009. DOI: 10.1007/s12052-009-0119-2. ISSN1936-6426. (ang.).
Sid Perkins. Step-hyphen;'s By-hyphen;'s Step Evolution: Mining the Gaps: Transitional fossils are the hardest to find, but sometimes tell the best stories. „Science News”. 175 (3), s. 30–33, 2009. DOI: 10.1002/scin.2009.5591750320. ISSN0036-8423. (ang.).
Louise S. Mead. Transforming Our Thinking about Transitional Forms. „Evolution: Education and Outreach”. 2 (2), s. 310–314, 2009. DOI: 10.1007/s12052-009-0126-3. ISSN1936-6426. (ang.).
Emanuele Rigato, Alessandro Minelli. The great chain of being is still here. „Evolution: Education and Outreach”. 6 (1), s. 18, 2013. DOI: 10.1186/1936-6434-6-18. ISSN1936-6434. (ang.).
Edward B. Daeschler, Neil H. Shubin, Farish A. Jenkins. A Devonian tetrapod-like fish and the evolution of the tetrapod body plan. „Nature”. 440 (7085), s. 757–763, 2006. DOI: 10.1038/nature04639. ISSN0028-0836. (ang.).
Jennifer A. Clack. The Fish–Tetrapod Transition: New Fossils and Interpretations. „Evolution: Education and Outreach”. 2 (2), s. 213–223, 2009. DOI: 10.1007/s12052-009-0119-2. ISSN1936-6426. (ang.).