H. H. Stoek, J. R. Fleming, A. J. Hoskin. A Study of Coal Mine Haulage in Illinois. Bulletin 132, University of Illinois Engineering Experiment Station, July 1922; pages 15–16.
International Correspondence Schools (1900). "Surface arrangements at a mine opened at a point below the tipple level". A Treatise on Coal Mining. The Colliery Engineer Co. pp. 33–35.
English Pit Ponies, The Colliery Engineer, Vol. VIII, No. 1 (August 1887); pages 6-7.
Colby, F. M.New International Yearbook: A Compendium of the World's Progress (1920), Frank Moore Colby, M.A., Editor, 1921, page 171. Retrieved 21 March 2018.
"The Care of Mine Mules". Mines and Minerals. XXXI (11). Colliery Engineer Company: 650. June 1911.
"Pit Ponies". Wollongong Heritage and Stories. Retrieved 4 August 2018.
youtube.com
Benedict, Les (director); Knudtson, Steve (producer) (1972). The Last Pony Mine (motion picture). Iowa State University Library, Special Collections. Available on YouTube in three parts: part 1, part 2, part 3.
"Elsecar 19". Bargain Hunt. Series 46, Episode 30 (16:20 – 19:00). 20 September 2017. BBC – via Youtube. Retrieved 21 March 2018.