1. Formaldehyde;Fieser and Fieser's Reagents for Organic Synthesis;2017-02-21
2. Formaldehyde;Fieser and Fieser's Reagents for Organic Synthesis;2017-02-20
3. Formaldehyde;Fieser and Fieser's Reagents for Organic Synthesis;2013-04-26
4. Formaldehyde;Fieser and Fieser's Reagents for Organic Synthesis;2013-04-26
5. Robinson-Schöpf Condensation;Comprehensive Organic Name Reactions and Reagents;2010-09-15