2000. McGraw-Hill, Inc. Ferguson, Derek.
Chicago Style aipamena2000. McGraw-Hill, Inc. Ferguson, Derek.
MLA aipamena2000. McGraw-Hill, Inc. Ferguson, Derek.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
2000. McGraw-Hill, Inc. Ferguson, Derek.
Chicago Style aipamena2000. McGraw-Hill, Inc. Ferguson, Derek.
MLA aipamena2000. McGraw-Hill, Inc. Ferguson, Derek.