Specialized Lectures to students (seminar-courses): University of Texas - University of Naples
International Lectures: Erice International School
National Lectures: Italian courses for Ph.D.
Courses: University of Oklahoma 1975-1985 - Undergraduate Astronomy and Astrophysics - Graduate Astrophysics - Cosmology - Università degli Studi di Milano 1986 to Present - Astronomy and Astrophysics - Extragalactic Astronomy - Observational Cosmology