APA

(1968). Flowering plants. New York, USA: B.P.C. Publishing Ltd.

Chicago

1968. Flowering plants. New York, USA: B.P.C. Publishing Ltd.

Harvard

(1968). Flowering plants. New York, USA: B.P.C. Publishing Ltd.

MLA

Flowering plants. New York, USA: B.P.C. Publishing Ltd. 1968.