Who directed 'Saturday Night Fever' (1977)?

In what year was 'Close Encounters of the Third Kind' released? In what year was 'Annie Hall' released? Who directed 'Grease' (1978)? In what year was 'Grease' released? In what year was 'Saturday Night Fever' released? In what year was 'Alien' released? Who directed 'Aliens' (1986)? In what year was 'Blade Runner' released?