निम्नलिखित में से किसे प्रलेखन सूची (documentation list) या द्वितीयक/तृतीयक ग्रंथसूची स्रोत के रूप में वर्गीकृत नहीं किया गया है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?