APA
Ekspong G. E., . (1991). Oskar Klein memorial lectures. World Scientific, Publishing Co. Pvt. Ltd., Singapore: .
Chicago
Ekspong Gosta Ed, . 1991. Oskar Klein memorial lectures. World Scientific, Publishing Co. Pvt. Ltd., Singapore: .
Harvard
Ekspong G. E., . (1991). Oskar Klein memorial lectures. World Scientific, Publishing Co. Pvt. Ltd., Singapore: .
MLA
Ekspong Gosta Ed, . Oskar Klein memorial lectures. World Scientific, Publishing Co. Pvt. Ltd., Singapore: . 1991.