Cita APA (7a ed.)

Sitter, L. U. d., & Boschma, D. (1966). Explanation geological map of the palaeozoic of the southern cantabrian mountains 1: 50000 sheet 1 Pisuerga. s.n.

Cita Chicago Style (17a ed.)

Sitter, L. U. de, y D. Boschma. Explanation Geological Map of the Palaeozoic of the Southern Cantabrian Mountains 1: 50000 Sheet 1 Pisuerga. [S.l.: s.n, 1966.

Cita MLA (9a ed.)

Sitter, L. U. de, y D. Boschma. Explanation Geological Map of the Palaeozoic of the Southern Cantabrian Mountains 1: 50000 Sheet 1 Pisuerga. s.n, 1966.