Hach company. (1991). Products for analysis 1991-92. USA: Hach company.
Trích dẫn kiểu ChicagoHach company. Products for Analysis 1991-92. USA: Hach company, 1991.
ציטוט MLAHach company. Products for Analysis 1991-92. USA: Hach company, 1991.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.