APA
(1993). An improved sieving machine for estimation of soil aggregate stability [SAS]. [s.l.]: [s.n.].
Chicago
1993. An improved sieving machine for estimation of soil aggregate stability [SAS]. [s.l.]: [s.n.].
Harvard
(1993). An improved sieving machine for estimation of soil aggregate stability [SAS]. [s.l.]: [s.n.].
MLA
An improved sieving machine for estimation of soil aggregate stability [SAS]. [s.l.]: [s.n.]. 1993.