Gaya APA
PE, R, H., Rosentreter, E, E. ().
STANDARDS 1986 American Society of Agricultural Engineers .
North American:
.
Gaya MLA
PE, Russell, H.hahn,., Rosentreter, Evelyn, E..
"STANDARDS 1986 American Society of Agricultural Engineers".
North American:
,
.
Teksbook.