Cita APA (7a ed.)

Lesquereux, L. Atlas to the coal flora of Pennsylvania and of the carboniferous formation throughout the United States.

Cita Chicago Style (17a ed.)

Lesquereux, Leo. Atlas to the Coal Flora of Pennsylvania and of the Carboniferous Formation Throughout the United States. Harrisburg.

Cita MLA (8a ed.)

Lesquereux, Leo. Atlas to the Coal Flora of Pennsylvania and of the Carboniferous Formation Throughout the United States.