Tunnel No. 7 and gallery, 15 miles above Yale, looking down valley, known by the labourers as the "slaughter pen."
MLA
Maynard, Richard, 1832-1907. Tunnel No. 7 and gallery, 15 miles above Yale, looking down valley, known by the labourers as the "slaughter pen.". ca. 1881. https://collections.library.yale.edu/catalog/2010975.
APA, 6th edition
Maynard, Richard, 1832-1907. (ca. 1881)[Tunnel No. 7 and gallery, 15 miles above Yale, looking down valley, known by the labourers as the "slaughter pen."]. https://collections.library.yale.edu/catalog/2010975.