APA
(1948). PERTUBATION METHODS IN THE QUANTIM MECHANICS OF N- ELECTRON SYSTEMS. New york: Hafner publishing company.
Chicago
1948. PERTUBATION METHODS IN THE QUANTIM MECHANICS OF N- ELECTRON SYSTEMS. New york: Hafner publishing company.
Harvard
(1948). PERTUBATION METHODS IN THE QUANTIM MECHANICS OF N- ELECTRON SYSTEMS. New york: Hafner publishing company.
MLA
PERTUBATION METHODS IN THE QUANTIM MECHANICS OF N- ELECTRON SYSTEMS. New york: Hafner publishing company. 1948.