Wik, Reynold M.. "Frontmatter". Steam Power on the American Farm, Philadelphia: University of Pennsylvania Press, 1953, pp. I-VI. https://doi.org/10.9783/9781512808469-fm
Wik, R. (1953). Frontmatter. In Steam Power on the American Farm (pp. I-VI). Philadelphia: University of Pennsylvania Press. https://doi.org/10.9783/9781512808469-fm
Wik, Reynold M.. "Frontmatter" In Steam Power on the American Farm, I-VI. Philadelphia: University of Pennsylvania Press, 1953. https://doi.org/10.9783/9781512808469-fm
Wik R. Frontmatter. In: Steam Power on the American Farm. Philadelphia: University of Pennsylvania Press; 1953. p.I-VI. https://doi.org/10.9783/9781512808469-fm