Frenkel, R. E. (1970). Ruderal vegetation along some California roadside s. University of California Press.
Cita Chicago (17th ed.)Frenkel, Robert E. Ruderal Vegetation Along Some California Roadside S. Berkeley: University of California Press, 1970.
Cita MLA (9th ed.)Frenkel, Robert E. Ruderal Vegetation Along Some California Roadside S. University of California Press, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.