TY  - BOOK
AU  - Sienko, Michell J
TI  - Stoichiometry and structure: freshman chemistry problems and how to solve them 
AV  - QD 42 S4
PY  - 1964///
CY  - New York
PB  - W.A. Benjamin
KW  - Química -
KW  - Problemas, ejercicios, etc
ER  -