Citazione Stile APA (7a Edizione)

HOWARD , J. (1997). I CAN READ ABOUT FOSSILS. TROLL ASSOCIATES.

Citazione stile Chigago Style (17a edizione)

HOWARD , JOHN. I CAN READ ABOUT FOSSILS. USA: TROLL ASSOCIATES, 1997.

Citatione MLA (9a ed.)

HOWARD , JOHN. I CAN READ ABOUT FOSSILS. TROLL ASSOCIATES, 1997.