Gaya APA

Ravensburg, O, M, V. (1999). Melacak Alam (cet.5; 1999) . Bandung: Angkasa.

Gaya MLA

Ravensburg, Otto, Maier, Verlag. "Melacak Alam (cet.5; 1999)". Bandung: Angkasa, 1999. Printed Book.