Melvin Berger. (2003). Spinning Spiders (Let's-Read-and-Find-Out Science 2) (1.). HarperCollins.
Cita Chicago (17th ed.)Melvin Berger. Spinning Spiders (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 2003.
Cita MLA (9th ed.)Melvin Berger. Spinning Spiders (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.