Mystery of the ancients : Early spacemen and the Mayas.

MLA

Umland, Eric, and Craig Umland. Mystery of the Ancients : Early Spacemen and the Mayas. Panther (Souvenir), 1975.

APA

Umland, E., & Umland, C. (1975). Mystery of the ancients : Early spacemen and the Mayas. Panther (Souvenir).

Chicago

Umland, Eric, and Craig Umland. Mystery of the Ancients: Early Spacemen and the Mayas. : Panther (Souvenir), 1975.