[Plate: Levels (Engineering instruments)]
MLA
[Plate: Levels (Engineering Instruments)]. 0AD. https://collections.library.yale.edu/catalog/2068706.
APA, 6th edition
[Plate: Levels (Engineering instruments)]. (0 C.E.). [Illustrations, Prints (Visual works), Woodcuts]. https://collections.library.yale.edu/catalog/2068706.