APA

Parker S., Barwich T., . (2002). Space Aliens. London: Belitha Press.

Chicago

Parker Steve, Barwich Tessa, . 2002. Space Aliens. London: Belitha Press.

Harvard

Parker S., Barwich T., . (2002). Space Aliens. London: Belitha Press.

MLA

Parker Steve, Barwich Tessa, . Space Aliens. London: Belitha Press. 2002.