Citazione Stile APA (7a Edizione)

Gibbs, P. (1939). Across the frontiers (New and rev. ed.). Right Book Club.

Citazione stile Chigago Style (17a edizione)

Gibbs, Philip. Across the Frontiers. New and rev. ed. London: Right Book Club, 1939.

Citatione MLA (8a ed.)

Gibbs, Philip. Across the Frontiers. New and rev. ed. Right Book Club, 1939.