Books:

1. H. Fehling (1849). "Die quantitative Bestimmung von Zucker und Stärkmehl mittelst Kupfervitriol". Annalen der Chemie und Pharmacie 72 (1): 106–113.
2. Advanced Practical Organic Chemistry- N K Vishnoi
3. IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006-) "Haworth representation

Webliography:

1. http://en.wikipedia.org/wiki/Methylene_blue
2. http://en.wikipedia.org/wiki/Fehling%27s_solution
3. http://en.wikipedia.org/wiki/Glucose

Image Sources:

1. http://www.diabetesinfo.org.au/webdata/images/Food%20glucose%20and%20the%20body.JPG 
2. http://en.wikipedia.org/wiki/Fischer_projection