APA

Heath W., Parsley L. & Dowling J. (1978). Terrestrial photogrammetric surveys of unstable terrain in Colombia. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 816.

Chicago

Heath W, Parsley LL and Dowling JWF. 1978. Terrestrial photogrammetric surveys of unstable terrain in Colombia. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 816.

Harvard

Heath W., Parsley L. and Dowling J. (1978). Terrestrial photogrammetric surveys of unstable terrain in Colombia. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 816.

MLA

Heath W, Parsley LL and Dowling JWF. Terrestrial photogrammetric surveys of unstable terrain in Colombia. Crowthorne: Transport and Road Research Laboratory. Lab. report nr 816. 1978.