Hou, X. G.; Bergstrom J, (1991) The arthropods of the Lower Cambrian Chengjiang fauna, with relationship and evolutionary significance, p.
…………………………………………………………………………………………………………. यो मुलुक सिंगापुर जस्तो बनिसकेको छैन मात्र राजनीतिक परिवर्तन...