Weitz, R., Landau, Y. H., & Marton, S. T. (1966). Some Development Problems of Family Farms. o.V..

Weitz, R., Y. H. Landau, and S. T. Marton. Some Development Problems of Family Farms. [ohne Ort]: o.V., 1966.

Weitz, R., et al. Some Development Problems of Family Farms. o.V., 1966.