APA ציטוט

Hartmann, W. K., & William K. Hartmann; Chris Impey. Astronomy: The cosmic journey. Pacific Grove, CA: Brooks/Cole.

Trích dẫn kiểu Chicago

Hartmann, William K., và William K. Hartmann; Chris Impey. Astronomy: The Cosmic Journey. Pacific Grove, CA: Brooks/Cole.

ציטוט MLA

Hartmann, William K., và William K. Hartmann; Chris Impey. Astronomy: The Cosmic Journey. Pacific Grove, CA: Brooks/Cole.