The objective of this book is to explore these new and traditional sources of finance; suggest how these phenomena can be better understood conceptually; and guide new ways of understanding the topic in future, especially for researchers. The introduction outlines the new sources of entrepreneurial finance, and in comparing them with more traditional sources, proposes challenges in our conceptual understanding of these new and traditional sources. The subsequent chapters deal with important topics, including looking at the way different funding sources may interact; factors that impede family firms from getting external funding; how best to succeed with equity crowdfunding by looking at pre-selection processes; considering differences in perceptions towards funding sources arising from whether entrepreneurs are native born or immigrants; factors to consider when funding specialized assets in high uncertain sectors such as biotechnology; and the internationalization of business angel activity. This book was originally published as a special issue of the journal.