Cita APA (7a ed.)
Williamson, R. A. (1979). Archaeoastronomy in the Americas. University of Maryland, Center for Archaeoastronomy.
Cita estilo Chicago (17a ed.)
Williamson, Ray A. Archaeoastronomy in the Americas. Maryland, EUA: University of Maryland, Center for Archaeoastronomy, 1979.
Cita MLA (9a ed.)
Williamson, Ray A. Archaeoastronomy in the Americas. University of Maryland, Center for Archaeoastronomy, 1979.
Precaución: Estas citas no son 100% exactas.