Cita APA

Smith, J., & Christophers, A. (1993). Reply to the letter from Professor Hardell. Nature Publishing Group.

Chicago Style Citation

Smith, J.G., i A.J Christophers. Reply to the Letter From Professor Hardell. Nature Publishing Group, 1993.

Cita MLA

Smith, J.G., i A.J Christophers. Reply to the Letter From Professor Hardell. Nature Publishing Group, 1993.