APA Citation

Ambler, E. (1987). The dark frontier (Collins English Library level 6). William Collins Sons.

Chicago Style Citation

Ambler, Eric. The Dark Frontier (Collins English Library Level 6). William Collins Sons, 1987.

MLA Citation

Ambler, Eric. The Dark Frontier (Collins English Library Level 6). William Collins Sons, 1987.

Warning: These citations may not always be 100% accurate.