APA
ridpath i., . (1987). illustrated dictonary of astronomy & astronautice. berut: librairie duliban.
Chicago
ridpath ian, . 1987. illustrated dictonary of astronomy & astronautice. berut: librairie duliban.
Harvard
ridpath i., . (1987). illustrated dictonary of astronomy & astronautice. berut: librairie duliban.
MLA
ridpath ian, . illustrated dictonary of astronomy & astronautice. berut: librairie duliban. 1987.
