| Parasitic weeds of the world: biology and control. C Parker, CR Riches | 1457 | 1993 |
| Parasitic weeds: a world challenge C Parker Weed science 60 (2), 269-276, 2012 | 291 | 2012 |
| Parasitic plants in Ethiopia C Parker Walia, 21-27, 1988 | 19 | 1988 |
| A personal history in parasitic weeds and their control C Parker Plants 10 (11), 2249, 2021 | 6 | 2021 |
| Parthenium hysterophorus (parthenium weed) J Vélez-Gavilán, A Shabbir, C Parker Invasive Species Compend 45573, 2019 | 4 | 2019 |
| Weeds in Ethiopia, Conclusions from Seven Weeks Survey (September/October 1969). ARC C Parker Weed Research Organization, Begbroke Hill, Yarnton, Oxford, UK, 1970 | 3 | 1970 |
| WEED RISK ASSESSMENT–AN ATTEMPT TO PREDICT FUTURE INVASIVE WEEDS OF USA C Parker EXPERT CONSULTATION ON WEED RISK ASSESSMENT, 33, 2002 | 2 | 2002 |
| Weeds of Bhutan P Chris NPPC Simtokha, Royal Government of Bhutan, 1992 | 2 | 1992 |
| Parthenium hysterophorus (parthenium weed). P Weyl, J Vélez-Gavilán, S Asad, C Parker Invasive Species Compendium, 2019 | | 2019 |
| Risk assessment of weeds. C Parker | | 2004 |
