Each exam item (a question with its possible answers) has at least two references to standard books or other sources of project management. Most of the questions reference the PMI A Guide to the Project Management Body of Knowledge (aka the PMBOK Guide).
The Rite of Spring (Le Sacre du Printemps) is a ballet in two parts. The entire ballet was a concept developed by Igor Stravinsky. He wrote the music. The set and costumes were designed by Nicholas Roerich.
The 1st day of spring marks the spring equinox, a time of renewed passion, transformation and rebirth. This year on the 20th March at 04.30am GMT, the sun shines directly on the equator. This day is the 1st day of spring on our calendar and known as the spring equinox.