Autor
National Science Teachers Association
American Council of Science Teachers
2
American Science Teachers Association
2
Illinois Association of Chemistry Teachers
2
Akademii͡a nauk SSSR. Quantum Bureau
1
American Association of Physics Teachers
1
National Council of Teachers of Mathematics
1
Rossiĭskai͡a akademii͡a nauk. Quantum Bureau
1
Thomson Gale (Firm)
1