Siehl, G. (1973). Environment Update; A Review of Environmental Materials and Developments in 1972.
Citazione stile Chigago Style (17a edizione)Siehl, Geroge. Environment Update; A Review of Environmental Materials and Developments in 1972. 1973.
Citatione MLA (9a ed.)Siehl, Geroge. Environment Update; A Review of Environmental Materials and Developments in 1972. 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.