APA (7e ed.) Bronvermelding

Não informado. (1969). Science activities. Science Activities Publishing.

Chicago (17e ed.) Bronvermelding

Não informado. Science Activities. Washington: Science Activities Publishing, 1969.

MLA (8e ed.) Bronvermelding

Não informado. Science Activities. Science Activities Publishing, 1969.

Let op: Deze citaties zijn niet altijd 100% accuraat.