APA-viite (7. p.)

Não informado. (1952). Elementary school science bulletin. National Science Teachers Association.

Chicago-viite (17. p.)

Não informado. Elementary School Science Bulletin. Washington: National Science Teachers Association, 1952.

MLA-viite (8. p.)

Não informado. Elementary School Science Bulletin. National Science Teachers Association, 1952.

Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.