APA

Artmann B., Griffiths H. B. & Artmann B. (1988). The concept of number. Chichester u.a: Ellis Horwood u.a.

Chicago

Artmann Benno, Griffiths Hubert Brian and Artmann Benno. 1988. The concept of number. Chichester u.a: Ellis Horwood u.a.

Harvard

Artmann B., Griffiths H. B. and Artmann B. (1988). The concept of number. Chichester u.a: Ellis Horwood u.a.

MLA

Artmann Benno, Griffiths Hubert Brian and Artmann Benno. The concept of number. Chichester u.a: Ellis Horwood u.a. 1988.