goh choo ta, mazlin mokhtar, lee khai ern, vun leong wan, lee jing, nurfashareena muhamad, sharina abdul halim, tanot unjah, ku adriani ku ayob, mohamad mahathir amir sultan, rd puteri khairani khirotdin, wan daraputri razali.  (2020).  national policy on the environment: state of the environment in malaysia (soe).  - .  1-206. 

ahmad fariz bin mohamed;riza bin sulaiman;shaharudin bin idrus;bisharuzi bin omar;khairul nizam bin abdul maulud;nik mohd noor faizul bin md saad;nor`ain binti mohd jali;rd puteri khairani binti khirotdin;shamsul bin khamis.  (2018).  ukm campus tree id and hazardous trees assessment.  - .  . 

mohamad mahathir amir sultan, wan daraputri razali, rd. puteri khairani khirotdin & nik mohd noor faizul md. saad.  (2016).  saving energy in office: what can we do?.  - salam lestari.  . 

rahmah elfithri; mazlin mokhtar; jasni yaakub; mohamad mahathir amir sultan; rd puteri khairani bt khirotdin; siti amirah ishak.  (2016).  technical report on establishment of sustainability science demonstration pilot project on restoring and managing langat river, malaysia for future.  - pemantapan kerangka dan m.  . 

nik mohd noor faizul md saad; wan daraputri razali; rd puteri khairani khirotdin: mohamad mahathir bin amir sultan; nazren leman.  (2015).  amalan kelestarian: inisiatif penjimatan air di pejabat.  - salam lestari 35.  . 

nik mohd noor faizul md saad, wan daraputri razali, nazren leman, mohamad mahathir amir sultan & rd. puteri khairani khirotdin.  (2014).  mengorak langkah merealisasikan ukm pendaulat amanah negara.  - salam lestari.  . 

jasni yaakob, rd puteri khairani khirotdin & nazren leman.  (2014).  sediment monitoring at the putrajaya wetland.  - jsps asian core program`s comprehensive symposium 4.  .