Roberts, T. J. The birds of Pakistan.
Chicago Style (17th ed.) ZitazioaRoberts, T. J. The Birds of Pakistan.
MLA (9th ed.) ZitazioaRoberts, T. J. The Birds of Pakistan.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
Roberts, T. J. The birds of Pakistan.
Chicago Style (17th ed.) ZitazioaRoberts, T. J. The Birds of Pakistan.
MLA (9th ed.) ZitazioaRoberts, T. J. The Birds of Pakistan.