Citazione Stile APA (7a Edizione)

Cossio, A., & Erre, M. (2016). Skating for the sky. [publisher not identified].

Citazione stile Chigago Style (17a edizione)

Cossio, Alexander, e Milton Erre. Skating for the Sky. Medellín, Colombia: [publisher not identified], 2016.

Citatione MLA (9a ed.)

Cossio, Alexander, e Milton Erre. Skating for the Sky. [publisher not identified], 2016.