Reference
The references are listed here:
https://github.com/mesos/spark/blob/master/repl/src/main/scala/spark/repl/SparkILoop.scala
http://spark.apache.org/docs/latest/api/python/pyspark.html#pyspark.SparkContext
http://www.scala-lang.org/api/current/index.html#scala.util.Properties$
http://spark.apache.org/docs/latest/api/java/org/apache/spark/SparkContext.html