APA
Pollard E, . (1993). Monitoring Butterflies for Ecology and Conservation : The British Butterfly Monitoring Scheme. LONDON: CHAPMAN & HALL.
Chicago
Pollard E, . 1993. Monitoring Butterflies for Ecology and Conservation : The British Butterfly Monitoring Scheme. LONDON: CHAPMAN & HALL.
Harvard
Pollard E, . (1993). Monitoring Butterflies for Ecology and Conservation : The British Butterfly Monitoring Scheme. LONDON: CHAPMAN & HALL.
MLA
Pollard E, . Monitoring Butterflies for Ecology and Conservation : The British Butterfly Monitoring Scheme. LONDON: CHAPMAN & HALL. 1993.