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The thermistor can be placed anywhere in the bridge with three constant resistors, but different placements can produce different behaviour in the bridge. For example, different placements might cause the output voltage to go in different directions as the temperature changes.
References
http://www.electronics-tutorials.ws/io/io_3.html
The Michigan Chemical Process Dynamics&Control, 2006, https://controls.engin.umich.edu/wiki/index.php/TemperatureSensors
Thomasnet, Types of Thermocouples, 2014, http://www.thomasnet.com/articles/automation-electronics/Thermocouples-Types
Wayne Storr, Basic Electronics Tutorials, http://www.electronics-tutorials.ws/io/io_3.html
Web material, Temperature Sensor- The Thermistor, http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Sensors/TempR.html
http://en.wikipedia.org/wiki/Thermistor