APA

Royston A., Harper P., . (1999). Pyramids. Bath: Readerr's Digest.

Chicago

Royston Angea, Harper Piers, . 1999. Pyramids. Bath: Readerr's Digest.

Harvard

Royston A., Harper P., . (1999). Pyramids. Bath: Readerr's Digest.

MLA

Royston Angea, Harper Piers, . Pyramids. Bath: Readerr's Digest. 1999.