Umland, J. B., & Jean B. Umland. (1999). General chemistry. Pacific Grove: Thomson Brooks/Cole.
Trích dẫn kiểu ChicagoUmland, Jean B., và Jean B. Umland. General Chemistry. Pacific Grove: Thomson Brooks/Cole, 1999.
ציטוט MLAUmland, Jean B., và Jean B. Umland. General Chemistry. Pacific Grove: Thomson Brooks/Cole, 1999.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.