APA

Garton- Sprenger J., Grenall S., . (1990). Flying Colours 1. Oxford: Heinemann.

Chicago

Garton- Sprenger J, Grenall S, . 1990. Flying Colours 1. Oxford: Heinemann.

Harvard

Garton- Sprenger J., Grenall S., . (1990). Flying Colours 1. Oxford: Heinemann.

MLA

Garton- Sprenger J, Grenall S, . Flying Colours 1. Oxford: Heinemann. 1990.