There are several large scale data sets that provide valuable information on national and cross-cultural differences:

The World Values Survey

- the World Values Survey (www.worldvaluessurvey.org) is a global network of social scientists studying changing values and their impact on social and political life. The survey, which started in 1981, consists of nationally representative surveys conducted in almost 100 countries which contain almost 90 percent of the world’s population, using a common questionnaire. The WVS is the largest non-commercial, cross-national, time series investigation of human beliefs and values ever executed, currently including interviews with almost 400,000 respondents. Moreover the WVS is the only academic study covering the full range of global variations, from very poor to very rich countries, in all of the world’s major cultural zones.

The WVS seeks to help scientists and policy makers understand changes in the beliefs, values, and motivations of people throughout the world. Thousands of political scientists, sociologists, social psychologists, anthropologists and economists have used these data to analyze such topics as economic development, democratization, religion, gender equality, social capital, and subjective well-being. These data have also been widely used by government officials, journalists and students, and groups at the World Bank have analyzed the linkages between cultural factors and economic development.

http://www.worldvaluessurvey.org/WVSContents.jsp

GLOBE

- GLOBE is an organization dedicated to the international study of the relationships among societal culture, leadership and organizational practices. With more than 200 researchers from 62 countries studying more than 17,000 mid-level managers in the initial phases, the 2004 study is the largest and most prestigious study of its kind in the social sciences. In the latest 2014 study, more than 70 researchers collected data from over 100 CEOs and 5,000 senior executives in corporations in a variety of industries in 24 countries. This study demonstrated the considerable influence of culture on societal leadership expectations and the importance of matching CEO behaviours to expectations for leadership effectiveness.

http://globeproject.com

Geert Hofstede

- much of Hofstede's work is now commercialized but useful is Hofstede's Insights which provides access to the cultural dimension values for a large number of countries.

https://www.hofstede-insights.com/product/compare-countries/

A useful starting point for any work on global leadership is Mary Ann Von Glinow and William D. Schneper Global and Comparative Leadership, Oxford Bibliographies.

http://www.oxfordbibliographies.com/view/document/obo-9780199846740/obo-9780199846740-0051.xml

For global teams see Bradley L. Kirkman and Sal Mistry Global Teams Oxford Bibliographies.

http://www.oxfordbibliographies.com/view/document/obo-9780199846740/obo-9780199846740-0006.xml