Special Topics in Heterocyclic Chemistry Arnold Weissberger, Edward C. Taylor E-Book (pdf) 15.09.2009

The Chemistry of Heterocyclic Compounds, Five Member Heterocyclic Compounds with Nitrogen & Sulfur or Nitrogen, Sulfur and Oxygen Except Thiazole L. L. Bambas, Arnold Weissberger E-Book (pdf) 15.09.2009

The Chemistry of Heterocyclic Compounds, Heterocyclic Derivatives of Phosphorous, Arsenic, Antimony and Bismuth Frederick G. Mann, Arnold Weissberger E-Book (pdf) 15.09.2009