For more information on what the Khanda represents go here.
Sikh image From Hari Singh covered by Creative Commons License
SIKHISM BL2017 - BL2018.7
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"Sikhism, an Indian religion founded in the Punjab in the late 15th century. Its members are known as Sikhs. The Sikhs call their faith Gurmat (Punjabi: “the Way of the Guru”). According to Sikh tradition, Sikhism was established by Guru Nanak (1469–1539) and subsequently led by a succession of nine other Gurus. All 10 human Gurus, Sikhs believe, were inhabited by a single spirit. Upon the death of the 10th, Guru Gobind Singh (1666–1708), the spirit of the eternal Guru transferred itself to the sacred scripture of Sikhism, Guru Granth Sahib (“The Granth as the Guru”), also known as the Adi Granth (“First Volume”), which thereafter was regarded as the sole Guru. In the early 21st century there were nearly 25 million Sikhs worldwide, the great majority of them living in the Indian state of Punjab." From Britannica Online Academic Edition, Available on the RWWL, AUC E-Resources
Gutka2 Image by Hari Singh, image used under Creative Commons License
Sikhism in Global Context by 
A Contemporary Look at Sikh Religion by 
Sikh Art and Literature by 
The Sikh Diaspora : Tradition and Change in an Immigrant Community by 
The Sikh Moral Tradition : Ethical Perceptions of the Sikhs in the Late Nineteenth/Early Twentieth Century by