Gaya APA

Hester, J, ., ., ., A, ., ]., bryam, , J. (2002). 21st Century Astronomy . : Norton.New York.

Gaya MLA

Hester, Jeff, ., ., .[et, Al, ., ]., bryam, , John. "21st Century Astronomy". : Norton.New York, 2002. Skripsi, Tesis, Disertasi.